This is a listing of all current truck, trailer, CR, DAS and DSR alarm codes. On multi-temp units, the zone will be identified. Please record all alarms that occur to assist technician in resolving issue. Alarm codes with parenthesis (XX) may exist with alarm code 84 and may clear automatically.
Alarm Code 00
Status: green OK to Run
Description: No Alarms Exist
Operator Action: No action required.
Alarm Code 02
Status: yellow Check as Specified
Description: Check Evaporator Coil Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 03
Status: yellow Check as Specified
Description: Check (Control); Return Air Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 04
Status: yellow Check as Specified
Description: Check (Control); Discharge Air Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 05
Status: green OK to Run
Description: Check Ambient Temp Sensor
Operator Action: Report alarm at end of day.
Alarm Code 06
Status: green OK to Run
Description: Check Coolant Temp Sensor
Operator Action: Report alarm at end of day.
Alarm Code 07
Status: green OK to Run
Description: Check Engine RPM Sensor
Operator Action: Report alarm at end of day.
Alarm Code 08
Status: yellow Check as Specified
Description: Unit Running on Coil Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code (09)
Status: yellow Check as Specified
Description: High Evaporator Temperature (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (10)
Status: red Take Immediate Action
Description: High Discharge Pressure (or Temperature)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 11
Status: yellow Check as Specified
Description: Unit or Zone Controlling on Alternate Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 12
Status: red Take Immediate Action
Description: Sensor or Digital Input Shutdown (Zone)
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 13
Status: yellow Check as Specified
Description: Sensor Check (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 14
Status: green OK to Run
Description: Defrost Terminated by Time
Operator Action: Report alarm at end of day.
Alarm Code 15
Status: yellow Check as Specified
Description: Check Glow Plugs or Intake Air Heater
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 16
Status: green OK to Run
Description: Manual Start Not Completed
Operator Action: Report alarm at end of day.
Alarm Code (17)
Status: yellow Check as Specified
Description: Engine Failed to Crank
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (18)
Status: yellow Check as Specified
Description: High Engine Coolant Temperature
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (19)
Status: yellow Check as Specified
Description: Low Engine Oil Pressure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (20)
Status: yellow Check as Specified
Description: Engine (Vapor Motor CR) Failed to Start
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (21)
Status: yellow Check as Specified
Description: Cooling Cycle Check (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code (22)
Status: yellow Check as Specified
Description: Heating Cycle Check (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 23
Status: red Take Immediate Action
Description: Cooling Cycle Fault (Zone)
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 24
Status: red Take Immediate Action
Description: Heating Cycle Fault (Zone)
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 25
Status: yellow Check as Specified
Description: Alternator Check
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (26)
Status: yellow Check as Specified
Description: Check Refrigeration Capacity (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code (27)
Status: red Take Immediate Action
Description: Vapor Motor RPM High (CR)
Operator Action: Unit cannot operate and is shut down. Repair immediately.
Alarm Code 28
Status: green OK to Run
Description: Pretrip or Self Check Abort
Operator Action: Report alarm at end of day.
Alarm Code 29
Status: yellow Check as Specified
Description: Defrost Damper Circuit Check (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 30
Status: red Take Immediate Action
Description: Defrost Damper Stuck Closed (Zone)
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 31
Status: yellow Check as Specified
Description: Check Oil Pressure Switch
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 32
Status: red Take Immediate Action
Description: Refrigeration Capacity Low (Zone)
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 33
Status: green OK to Run
Description: Check Engine RPM
Operator Action: Report alarm at end of day.
Alarm Code 34
Status: yellow Check as Specified
Description: Check Modulation Circuit
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 35
Status: red Take Immediate Action
Description: Check Run Relay Circuit
Operator Action: Unit cannot operate and is shut down. Repair immediately.
Alarm Code (36)
Status: red Take Immediate Action
Description: Electric Motor Failed to Run
Operator Action: Unit cannot operate and is shut down. Repair immediately. Switch to Diesel Mode.
Alarm Code 37
Status: green OK to Run
Description: Check Engine Coolant Level
Operator Action: Report alarm at end of day.
Alarm Code 38
Status: red Take Immediate Action
Description: Electric Phase Reversed
Operator Action: If unit/zone is shut down repair immediately.
Alarm Code 39
Status: yellow Check as Specified
Description: Check Water Valve Circuit
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 40
Status: yellow Check as Specified
Description: Check High Speed Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 41
Status: yellow Check as Specified
Description: Check Engine Coolant Temp
Operator Action: Report alarm at end of day.
Alarm Code 42
Status: yellow Check as Specified
Description: Unit Forced to Low Speed
Operator Action: Report alarm at end of day.
Alarm Code 43
Status: green OK to Run
Description: Unit Forced to Low Speed Modulation
Operator Action: Report alarm at end of day.
Alarm Code 44
Status: red Take Immediate Action
Description: Check Fuel System
Operator Action: Add fuel as necessary. Otherwise, report alarm at end of day.
Alarm Code 45
Status: yellow Check as Specified
Description: Check Hot Gas or Hot Gas Bypass Circuit
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 46
Status: yellow Check as Specified
Description: Check Air Flow (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 47
Status: red Take Immediate Action
Description: Remote Sensor Shutdown
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 48
Status: red Take Immediate Action
Description: Check Belts or Clutch
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 49
Status: green OK to Run
Description: Check Spare Sensor 1
Operator Action: Report alarm at end of day.
Alarm Code 50
Status: green OK to Run
Description: Reset Clock
Operator Action: Report alarm at end of day.
Alarm Code 51
Status: red Take Immediate Action
Description: Check Shutdown Circuit
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 52
Status: yellow Check as Specified
Description: Check Heat Circuit (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 53
Status: yellow Check as Specified
Description: Check Economizer Valve Circuit
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 54
Status: green OK to Run
Description: Test Mode Timeout
Operator Action: Clear alarm and restart unit.
Alarm Code 55
Status: green OK to Run
Description: Check Engine Speeds
Operator Action: Report alarm at end of day.
Alarm Code 56
Status: yellow Check as Specified
Description: Check Evaporator Fan Low Speed (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 57
Status: yellow Check as Specified
Description: Check Evaporator Fan High Speed (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 61
Status: yellow Check as Specified
Description: Low Battery Voltage
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 62
Status: red Take Immediate Action
Description: Ammeter Out of Calibration
Operator Action: Unit cannot operate and is shut down. Repair immediately.
Alarm Code (63)
Status: red Take Immediate Action
Description: Engine or Vapor Motor Stopped
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 64
Status: green OK to Run
Description: Pretrip Reminder
Operator Action: Report alarm at end of day.
Alarm Code 65
Status: yellow Check as Specified
Description: Abnormal Temperature Differential (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 66
Status: red Take Immediate Action
Description: Low Engine Oil Level
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 67
Status: yellow Check as Specified
Description: Check Liquid Line Solenoid Circuit (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 68
Status: red Take Immediate Action
Description: Internal Controller Fault Code
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 70
Status: green OK to Run
Description: Hourmeter Failure
Operator Action: Report alarm at end of day.
Alarm Code 71
Status: green OK to Run
Description: Hourmeter 4 Exceeds Set Time Limit
Operator Action: Report alarm at end of day.
Alarm Code 72
Status: green OK to Run
Description: Hourmeter 5 Exceeds Set Time Limit
Operator Action: Report alarm at end of day.
Alarm Code 73
Status: green OK to Run
Description: Hourmeter 6 Exceeds Set Time Limit
Operator Action: Report alarm at end of day.
Alarm Code 74
Status: green OK to Run
Description: Controller Reset to Defaults
Operator Action: Report alarm at end of day.
Alarm Code 75
Status: red Take Immediate Action
Description: Controller RAM Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 76
Status: red Take Immediate Action
Description: Controller EPROM Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 77
Status: red Take Immediate Action
Description: Controller EPROM Checksum Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 78
Status: red Take Immediate Action
Description: Data Log EPROM Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 79
Status: green OK to Run
Description: Internal Data Logger Overflow
Operator Action: Report alarm at end of day.
Alarm Code 80
Status: green OK to Run
Description: Check Compressor Temp Sensor
Operator Action: Report alarm at end of day.
Alarm Code 81
Status: red Take Immediate Action
Description: High Compressor Temp
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 82
Status: red Take Immediate Action
Description: High Compressor Temp Shutdown
Operator Action: Unit cannot operate and is shut down. Repair immediately.
Alarm Code 83
Status: green OK to Run
Description: Low Engine Coolant Temp
Operator Action: Report alarm at end of day.
Alarm Code 84
Status: green OK to Run
Description: Restart Null
Operator Action: Report alarm at end of day.
Alarm Code 85
Status: green OK to Run
Description: Forced Unit Operation
Operator Action: Report alarm at end of day.
Alarm Code 86
Status: green OK to Run
Description: Check Discharge Pressure Sensor
Operator Action: Report alarm at end of day.
Alarm Code 87
Status: green OK to Run
Description: Check Suction Pressure Sensor
Operator Action: Report alarm at end of day.
Alarm Code 88
Status: green OK to Run
Description: Reserved for CR
Operator Action:
Alarm Code 89
Status: green OK to Run
Description: Check Electronic Throttling Valve (ETV) Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 90
Status: green OK to Run
Description: Electric Overload
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 91
Status: green OK to Run
Description: Check Electric Ready Input
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 92
Status: green OK to Run
Description: Sensor Grades Not Set (Zone)
Operator Action: Report alarm at end of day.
Alarm Code 93
Status: green OK to Run
Description: Low Compressor Suction Pressure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 94
Status: green OK to Run
Description: Check Loader #1 Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 95
Status: green OK to Run
Description: Check Loader #2 Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 96
Status: yellow Check as Specified
Description: Low Fuel Level
Operator Action: Add fuel as required.
Alarm Code 97
Status: red Take Immediate Action
Description: Failed Remote Return Air Sensor (CR)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 98
Status: green OK to Run
Description: Check Fuel Level Sensor
Operator Action: Report alarm at end of day.
Alarm Code 99
Status: red Take Immediate Action
Description: High Compressor Pressure Ratio
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code (100)
Status: yellow Check as Specified
Description: Heater Fan Failure (CR)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 101
Status: red Take Immediate Action
Description: Controlling on Evap Coil Outlet Temp (CR)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code (102)
Status: yellow Check as Specified
Description: Low Evaporator Coil Temperature (CR)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 103
Status: yellow Check as Specified
Description: Low Heater Fuel Level (CR)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 104
Status: yellow Check as Specified
Description: Check Remote Fan Speed (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 105
Status: yellow Check as Specified
Description: Check Receiver Tank Press Sol Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 106
Status: yellow Check as Specified
Description: Check Purge Valve Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 107
Status: yellow Check as Specified
Description: Check Condenser Inlet Sol Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 108
Status: yellow Check as Specified
Description: Door Open Timeout (Zone)
Operator Action: Close doors. Report alarm at end of day.
Alarm Code 110
Status: yellow Check as Specified
Description: Check Suction Line Sol Circuit (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 111
Status: green OK to Run
Description: Unit Not Configured Correctly (Zone)
Operator Action: Report alarm at end of day.
Alarm Code 112
Status: yellow Check as Specified
Description: Check Remote Fans (Zone)
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 113
Status: yellow Check as Specified
Description: Check Electric Heat Circuit (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 114
Status: red Take Immediate Action
Description: Multiple Alarms - Can Not Run (Zone)
Operator Action: Unit/zone cannot operate and is shut down. Repair immediately.
Alarm Code 115
Status: yellow Check as Specified
Description: Check High Pressure Cut Out Switch
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 116
Status: green OK to Run
Description: Check High Pressure Cut In Switch
Operator Action: Report alarm at end of day.
Alarm Code 117
Status: green OK to Run
Description: Auto Switch from Diesel to Electric
Operator Action: Normal operation – does not affect performance.
Alarm Code 118
Status: green OK to Run
Description: Auto Switch from Electric to Diesel
Operator Action: Normal operation – does not affect performance.
Alarm Code 120
Status: yellow Check as Specified
Description: Check Alternator Excite Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 121
Status: yellow Check as Specified
Description: Check PMW Liquid Injection Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 122
Status: yellow Check as Specified
Description: Check Diesel/Electric Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 123
Status: yellow Check as Specified
Description: Check Evap Coil Inlet Temp Sensor (CR)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 124
Status: green OK to Run
Description: Check Evap Coil Outlet Temp Sensor (CR)
Operator Action: Report alarm at end of day.
Alarm Code 125
Status: yellow Check as Specified
Description: Check Tank Level Sensor (CR)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 126
Status: yellow Check as Specified
Description: Check Back Pressure Regulator (CR)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 127
Status: yellow Check as Specified
Description: Setpoint Not Entered (Zone)
Operator Action: Be sure setpoint is adjusted to required temperature.
Alarm Code 128
Status: green OK to Run
Description: Engine Run Time Maint Reminder #1/Service Due
Operator Action: Report alarm at end of day.
Alarm Code 129
Status: green OK to Run
Description: Engine Run Time Maint Reminder #2
Operator Action: Report alarm at end of day.
Alarm Code 130
Status: green OK to Run
Description: Engine Run Time Maint Reminder #1
Operator Action: Report alarm at end of day.
Alarm Code 131
Status: green OK to Run
Description: Electric Run Time Maint Reminder #2
Operator Action: Report alarm at end of day.
Alarm Code 132
Status: green OK to Run
Description: Total Unit Run Time Maint Reminder #1
Operator Action: Report alarm at end of day.
Alarm Code 133
Status: green OK to Run
Description: Total Unit Run Time Maint Reminder #2
Operator Action: Report alarm at end of day.
Alarm Code 134
Status: green OK to Run
Description: Controller Power On Hours
Operator Action: Report alarm at end of day.
Alarm Code 135
Status: green OK to Run
Description: Check Spare Digital Inputs
Operator Action: Report alarm at end of day.
Alarm Code 137
Status: green OK to Run
Description: Check Spare Digital Outputs
Operator Action: Report alarm at end of day.
Alarm Code 137
Status: yellow Check as Specified
Description: Check Damper Motor Heater Output
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 138
Status: green OK to Run
Description: Log DAS Real Time Clock Battery Failure (DAS)
Operator Action: Report alarm at end of day.
Alarm Code 139
Status: green OK to Run
Description: Abort Evacuation Mode
Operator Action: Report alarm at end of day.
Alarm Code 141
Status: yellow Check as Specified
Description: Auto Switch Diesel to Electric Disabled
Operator Action: Report alarm at end of day.
Alarm Code 142
Status: yellow Check as Specified
Description: Check Thermax Valve
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 143
Status: green OK to Run
Description: Check Remote Drain Hose Heater Output (Zone)
Operator Action: Report alarm at end of day.
Alarm Code 144
Status: red Take Immediate Action
Description: Lost CAN Communications to Expansion Module
Operator Action: Unit cannot operate and is shut down. Repair immediately.
Alarm Code 145
Status: yellow Check as Specified
Description: Lost Controller ON Feedback Signal
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 146
Status: green OK to Run
Description: Software Version Mismatch
Operator Action: Report alarm at end of day.
Alarm Code 147
Status: yellow Check as Specified
Description: Check Multi-Temp Fan Speed Control Output (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 148
Status: yellow Check as Specified
Description: Auto Switch Electric to Diesel Disabled
Operator Action: Report alarm at end of day.
Alarm Code 149
Status: yellow Check as Specified
Description: Alarm Not Identified
Operator Action: If unit/zone is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 150
Status: green OK to Run
Description: Sensor Out of Range Low (DAS and HMI) (Zone)
Operator Action: Report alarm at end of day.
Alarm Code 151
Status: green OK to Run
Description: Sensor Out of Range High (DAS and HMI) (Zone)
Operator Action: Report alarm at end of day.
Alarm Code 152
Status: green OK to Run
Description: DAS Failed Sensor (DAS)
Operator Action: Report alarm at end of day.
Alarm Code 153
Status: green OK to Run
Description: Expansion Module Flash Load Failure
Operator Action: Report alarm at end of day.
Alarm Code 154
Status: yellow Check as Specified
Description: Low Suction Pressure Switch Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 155
Status: red Take Immediate Action
Description: Lost CAN Communications to HMI
Operator Action: Unit cannot operate and is shut down. Repair immediately.
Alarm Code 156
Status: yellow Check as Specified
Description: Check Suction/Liquid Heat Exchanger Bypass Valve
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 157
Status: green OK to Run
Description: OptiSet Plus Profile Mismatch
Operator Action: Report alarm at end of day.
Alarm Code 158
Status: green OK to Run
Description: Primary Software Failed to Load
Operator Action: Report alarm at end of day.
Alarm Code 159
Status: green OK to Run
Description: Check Battery Condition
Operator Action: Report alarm at end of day.
Alarm Code 160
Status: green OK to Run
Description: Lost CAN Communications to Radio Expansion Board
Operator Action: Report alarm at end of day.
Alarm Code 161
Status: green OK to Run
Description: Log DAS Real Time Clock Invalid (DAS)
Operator Action: Report alarm at end of day.
Alarm Code 163
Status: yellow Check as Specified
Description: Emission Control Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 175
Status: yellow Check as Specified
Description: Check Electronic Expansion Valve (CR)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 176
Status: yellow Check as Specified
Description: Check Evaporator Pressure Sensor (CR)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 177
Status: yellow Check as Specified
Description: Check CO2 Tank Pressure Sensor (CR)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 178
Status: yellow Check as Specified
Description: Low CO2 Fuel Level (CR)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 180
Status: yellow Check as Specified
Description: TriPac Compressor Alarm
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 188
Status: yellow Check as Specified
Description: Log DAS Microprocessor Fault (DAS)
Operator Action: Report alarm at end of day.
Alarm Code 203
Status: yellow Check as Specified
Description: Check Display Return Air Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 204
Status: yellow Check as Specified
Description: Check Display Discharge Air Sensor (Zone)
Operator Action: Manually monitor temperature. Report alarm at end of day.
Alarm Code 216
Status: green OK to Run
Description: Check DAS Digital Inputs (DAS)
Operator Action: Report alarm at end of day.
Alarm Code 233
Status: green OK to Run
Description: REB Switching Off, Conservative to Full Null
Operator Action: Report alarm at end of day.
Alarm Code 234
Status: green OK to Run
Description: Check Relative Humidity Sensor Circuit
Operator Action: Report alarm at end of day.
Alarm Code 235
Status: green OK to Run
Description: High Engine Coolant Temperature Check
Operator Action: Report alarm at end of day.
Alarm Code 250
Status: green OK to Run
Description: DAS Clock Time Reset (DAS)
Operator Action: Report alarm at end of day.
Alarm Code 251
Status: green OK to Run
Description: Check Radio Expansion Board Configuration
Operator Action: Report alarm at end of day.
Alarm Code 252
Status: green OK to Run
Description: Check Auto Fresh Air Exchange Circuit
Operator Action: Report alarm at end of day.
Alarm Code 253
Status: green OK to Run
Description: REB On Back Up Battery, Alarms Disabled
Operator Action: Report alarm at end of day.
Alarm Code 254
Status: green OK to Run
Description: Check Auxiliary Coolant Temp Sensor
Operator Action: Report alarm at end of day.
Alarm Code 500
Status: yellow Check as Specified
Description: Check Host Evaporator Blower Low Speed
Operator Action: Not implemented
Alarm Code 501
Status: yellow Check as Specified
Description: Check Host Evaporator Blower High Speed
Operator Action: Not implemented
Alarm Code 505
Status: yellow Check as Specified
Description: Check Roadside Condenser Fan Motor Speed Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 506
Status: yellow Check as Specified
Description: Check Curbside Condenser Fan Motor Speed Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 507
Status: green OK to Run
Description: Check Digital Scroll Output Circuit (Scroll Only)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 508
Status: green OK to Run
Description: Speed Request Communication Error
Operator Action: Report alarm at end of day.
Alarm Code 509
Status: yellow Check as Specified
Description: ECU Failed to Enable
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 510
Status: yellow Check as Specified
Description: ECU Run Signal Failed
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 511
Status: green OK to Run
Description: Engine Wait to Start Time Delay Expired
Operator Action: Report alarm at end of day.
Alarm Code 512
Status: yellow Check as Specified
Description: High Compressor Suction Pressure (Scroll Only)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 513
Status: yellow Check as Specified
Description: Low Compressor Suction Ratio (Scroll Only)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 514
Status: yellow Check as Specified
Description: Low Compressor Discharge Pressure (Scroll Only)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 515
Status: yellow Check as Specified
Description: Minimum ETV Discharge Superheat Temp (Scroll)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 516
Status: red Take Immediate Action
Description: I/O Controller to Application Controller Com Failure
Operator Action: The unit is no longer able to operate and has been shut down. Repair immediately.
Alarm Code 518
Status: yellow Check as Specified
Description: Generator Ground Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 519
Status: yellow Check as Specified
Description: Check Battery Charger Input Power
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 520
Status: yellow Check as Specified
Description: Check Battery Charger Output Power
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 521
Status: yellow Check as Specified
Description: Battery Charger External/Environmental Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 522
Status: yellow Check as Specified
Description: Battery Temperature Sensor Alarm
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 523
Status: yellow Check as Specified
Description: Battery Charger Indicated Conditions
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 524
Status: yellow Check as Specified
Description: Generator Op Limit Vout to Frequency Ration
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 525
Status: yellow Check as Specified
Description: Generator Frequency Range Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 526
Status: yellow Check as Specified
Description: Generator Operational Limit Output Current
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 528
Status: yellow Check as Specified
Description: Failed J1939 CAN Comm Base Controller/Charger
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 529
Status: yellow Check as Specified
Description: Check Fuel Pump Circuit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 530
Status: yellow Check as Specified
Description: Low Pressure Differential (Scroll only)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 531
Status: yellow Check as Specified
Description: Check Economizer Pressure Sensor (Scroll only)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 538
Status: yellow Check as Specified
Description: Engine J1939 CAN Data Link Degraded
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 539
Status: yellow Check as Specified
Description: Engine J1939 CAN Data Link Failed
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 540
Status: yellow Check as Specified
Description: Illegal Engine Operating State
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 542
Status: green OK to Run
Description: Battery Charger Fault – Unit Forced to Low Speed
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 543
Status: green OK to Run
Description: Battery Charger Internal Short
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 544
Status: green OK to Run
Description: Battery Charger External Short
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 545
Status: green OK to Run
Description: Battery Charger Output Voltage Exceeded Limit
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 546
Status: green OK to Run
Description: Battery Charger Operating Bulk Voltage Out of Range
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 547
Status: yellow Check as Specified
Description: AC Bus Phase Loss
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 548
Status: green OK to Run
Description: Battery Charger Temperature Below Operating Range
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 549
Status: green OK to Run
Description: Battery Charger AC Input Overvoltage
Operator Action: Maintenance information only. Report alarm at end of day.
Alarm Code 550
Status: yellow Check as Specified
Description: Battery Charger Internal Overvoltage Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 551
Status: green OK to Run
Description: Battery Charger Internal Temp Sensor Fault
Operator Action:
Alarm Code 552
Status: green OK to Run
Description: Battery Charger Charging – Low Battery
Operator Action:
Alarm Code 553
Status: green OK to Run
Description: Battery Charger Operating Derated Due to High temp
Operator Action:
Alarm Code 599
Status: green OK to Run
Description: Engine Service Tool Connected
Operator Action: Report alarm at end of day.
Alarm Code 600
Status: green OK to Run
Description: Check Crankshaft Speed Sensor
Operator Action: Report alarm at end of day.
Alarm Code 601
Status: green OK to Run
Description: Check Camshaft Speed Sensor
Operator Action: Report alarm at end of day.
Alarm Code 603
Status: green OK to Run
Description: Check Exhaust Pressure Sensor
Operator Action: Report alarm at end of day.
Alarm Code 604
Status: green OK to Run
Description: Check Coolant Temp Sensor
Operator Action: Report alarm at end of day.
Alarm Code 605
Status: green OK to Run
Description: Check Fresh Air Temp Sensor
Operator Action: Report alarm at end of day.
Alarm Code 607
Status: green OK to Run
Description: Check Fuel Temperature Sensor
Operator Action: Report alarm at end of day.
Alarm Code 608
Status: green OK to Run
Description: Check Rail Pressure Sensor
Operator Action: Report alarm at end of day.
Alarm Code 609
Status: green OK to Run
Description: Check Intake Pressure Sensor
Operator Action: Report alarm at end of day.
Alarm Code 610
Status: green OK to Run
Description: Check Atmospheric Pressure Sensor
Operator Action: Report alarm at end of day.
Alarm Code 611
Status: green OK to Run
Description: Check Glow Plug Circuit
Operator Action: Report alarm at end of day.
Alarm Code 613
Status: green OK to Run
Description: Check Injectors
Operator Action: Report alarm at end of day.
Alarm Code 614
Status: green OK to Run
Description: Check High Pressure Fuel Pump
Operator Action: Report alarm at end of day.
Alarm Code 615
Status: yellow Check as Specified
Description: Rail Pressure Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 616
Status: yellow Check as Specified
Description: Engine Overspeed
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 617
Status: yellow Check as Specified
Description: Internal ECU Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 618
Status: green OK to Run
Description: Check EGR System
Operator Action: Report alarm at end of day.
Alarm Code 619
Status: green OK to Run
Description: ECU Main Relay Fault
Operator Action: Report alarm at end of day.
Alarm Code 620
Status: yellow Check as Specified
Description: No RPM Detected During Start Attempt
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 623
Status: green OK to Run
Description: TRUCAN Message Timeout
Operator Action: Report alarm at end of day.
Alarm Code 624
Status: green OK to Run
Description: Check EGR Temperature Sensor
Operator Action: Report alarm at end of day.
Alarm Code 625
Status: green OK to Run
Description: Check Intake Air Temperature Sensor
Operator Action: Report alarm at end of day.
Alarm Code 626
Status: green OK to Run
Description: Check Exhaust Temperature Sensor
Operator Action: Report alarm at end of day.
Alarm Code 642
Status: green OK to Run
Description: ECU Forced Low Speed
Operator Action: Report alarm at end of day.
Alarm Code 699
Status: yellow Check as Specified
Description: Unknown ECU Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 800
Status: green OK to Run
Description: Crankshaft Position Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 801
Status: green OK to Run
Description: Camshaft Position Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 804
Status: green OK to Run
Description: Engine Coolant Temperature Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 807
Status: green OK to Run
Description: Fuel Temperature Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 808
Status: green OK to Run
Description: Rail Pressure Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 809
Status: green OK to Run
Description: Intake Air Pressure Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 810
Status: green OK to Run
Description: Atmospheric Pressure Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 811
Status: green OK to Run
Description: Glow Plug Circuit Error
Operator Action: Report alarm at end of day.
Alarm Code 813
Status: green OK to Run
Description: General Injector Error
Operator Action: Report alarm at end of day.
Alarm Code 815
Status: yellow Check as Specified
Description: Fuel Pressure Regulator Error
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 818
Status: green OK to Run
Description: EGR Valve Actuator Error
Operator Action: Report alarm at end of day.
Alarm Code 819
Status: green OK to Run
Description: ECU Power Relay Error
Operator Action: Report alarm at end of day.
Alarm Code 825
Status: green OK to Run
Description: T1 Air Intake Temperature Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 826
Status: green OK to Run
Description: T2 Air Intake Temperature Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 827
Status: green OK to Run
Description: EGR Valve Position Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 828
Status: green OK to Run
Description: Lambda System Error
Operator Action: Report alarm at end of day.
Alarm Code 829
Status: green OK to Run
Description: Main ECU Relay Error
Operator Action: Report alarm at end of day.
Alarm Code 829
Status: green OK to Run
Description: Engine Communication Error
Operator Action: Report alarm at end of day.
Alarm Code 830
Status: green OK to Run
Description: Air Flow Meter Error
Operator Action: Report alarm at end of day.
Alarm Code 832
Status: green OK to Run
Description: Engine Power Supply Error
Operator Action: Report alarm at end of day.
Alarm Code 833
Status: green OK to Run
Description: High Pressure Pump Fuel Metering Unit Error
Operator Action: Report alarm at end of day.
Alarm Code 834
Status: green OK to Run
Description: Water in Fuel Sensor Error
Operator Action: Report alarm at end of day.
Alarm Code 836
Status: green OK to Run
Description: Major ECU Failures
Operator Action: Report alarm at end of day.
Alarm Code 838
Status: green OK to Run
Description: Intake Air System Error
Operator Action: Report alarm at end of day.
Alarm Code 839
Status: green OK to Run
Description: Engine Speed Error
Operator Action: Report alarm at end of day.
Alarm Code 840
Status: green OK to Run
Description: Fuel Injection Energizing Error
Operator Action: Report alarm at end of day.
Alarm Code 841
Status: green OK to Run
Description: High Pressure Pump Wear
Operator Action: Report alarm at end of day.
Alarm Code 842
Status: green OK to Run
Description: Engine Running in Safe Mode – Low Speed
Operator Action: Report alarm at end of day.
Alarm Code 843
Status: green OK to Run
Description: Fuel Injection System Error
Operator Action: Report alarm at end of day.
Alarm Code 844
Status: green OK to Run
Description: Engine Failed to Crank
Operator Action: Report alarm at end of day.
Alarm Code 845
Status: green OK to Run
Description: Starter Relay Error
Operator Action: Report alarm at end of day.
Alarm Code 846
Status: green OK to Run
Description: T50 Switch Error
Operator Action: Report alarm at end of day.
Alarm Code 847
Status: green OK to Run
Description: Variant Coding Error
Operator Action: Report alarm at end of day.
Alarm Code 853
Status: yellow Check as Specified
Description: Engine Overspeed (No DTC)
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 854
Status: yellow Check as Specified
Description: Engine Protection Self Shutdown
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code 899
Status: yellow Check as Specified
Description: Unknown ECU Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code SOF
Status: red Take Immediate Action
Description: Microprocessor Software Failure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code tEP
Status: red Take Immediate Action
Description: Electric Standby Motor Thermal Protection Alarm
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code - C -
Status: red Take Immediate Action
Description: Communications Failure, Microprocessor to In-Cab Control Box
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code dr2
Status: yellow Check as Specified
Description: Door 2 Open/Door Switch 2 Failure
Operator Action: Close door. Report alarm at end of day.
Alarm Code LP
Status: red Take Immediate Action
Description: Low Suction Pressure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code P1E
Status: yellow Check as Specified
Description: Return Air Temperature Sensor Fault
Operator Action: Report alarm at end of day.
Alarm Code HP
Status: red Take Immediate Action
Description: High Discharge Pressure
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code dr1
Status: yellow Check as Specified
Description: Door 1 Open/Door Switch 1 Failure
Operator Action: Close door. Report alarm at end of day.
Alarm Code OL
Status: red Take Immediate Action
Description: Electric Standby Overload
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code P2E
Status: yellow Check as Specified
Description: Remote Return Air Temperature Sensor Fault
Operator Action: Report alarm at end of day.
Alarm Code bAt
Status: red Take Immediate Action
Description: Low Battery Voltage
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code tP4
Status: red Take Immediate Action
Description: Power Supply Thermal Protection Alarm
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code PSE
Status: red Take Immediate Action
Description: High Pressure Sensor Fault
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
Alarm Code tCO
Status: red Take Immediate Action
Description: Electronic Control Module Internal Temperature Exceeds Limit
Operator Action: If unit is shut down repair immediately. Otherwise, report alarm at end of day.
FAQs
Thermo King fault codes are usually displayed on the refrigeration unit's control panel screen. Each code consists of a number that corresponds to a specific issue or system error.
To read the code, refer to the display or menu where alarms and faults are listed. Make note of the code provided and any associated message or indicator.
You can find the meaning of your fault code on this page or in your Thermo King operator’s manual. Alternatively, contact a Thermo King dealer near you for alarm code support. The code descriptions listed above will provide guidance on possible causes and recommended actions to resolve the issue.
A blinking red light on a Thermo King reefer unit typically indicates an active alarm or fault condition. This warning means the system has detected something that requires attention, such as a component malfunction, temperature issue, or maintenance need. Consult the control display for specific fault codes or messages to determine the exact problem.
No, it is not safe to ignore Thermo King alarm codes. Alarm codes often signal potential mechanical issues, operational failures, or safety risks.
Ignoring alarms can lead to equipment damage, reduced efficiency or spoiled goods. Always address alarm codes promptly by following troubleshooting procedures or contacting a qualified technician near you .
To clear a reefer alarm code, resolve the underlying issue causing the alarm by following recommended troubleshooting steps. Once fixed, use the control panel to acknowledge and clear the alarm. This often involves navigating to the alarm menu, selecting the alarm, and pressing the "clear" or "reset" button. Refer to the operator's manual for model-specific instructions or contact a Thermo King dealer near you.
To reset an APU (Auxiliary Power Unit) error code, first address the fault by repairing or correcting the issue. Then, use the APU's control interface to access the error code menu and select the reset or clear option.
In some cases, cycling the power off and back on after the repair may reset the code. Always consult your model’s manual for detailed procedures or contact a dealer near you .
