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Alarm Codes
Thermo King Precedent Unit Alarm Codes
COLOR CODE DEFINITIONS
OK TO RUN
CHECK AS SPECIFIED
TAKE IMMEDIATE ACTION
Num
Description
Operator Action
00
No Alarms Exist
No action required.
02
Check Evaporator Coil Sensor
Manually monitor load temperature. Report alarm at end of
day.
03
Check (Control) Return Air Sensor
Manually monitor load temperature. Report alarm at end of
day.
04
Check (Control) Discharge Air
Sensor
Manually monitor load temperature. Report alarm at end of
day.
05
Check Ambient Temp Sensor
Report alarm at end of day.
06
Check Coolant Temp Sensor
Report alarm at end of day.
07
Check Engine RPM Sensor
Report alarm at end of day.
(09)
High Evaporator Temperature
Manually monitor load temperature. Report alarm at end of
the day.
(10)
High Discharge Pressure
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
11
Unit Controlling on Alternate Sensor
Manually monitor load temperature. Report alarm at end of
day.
12
Sensor or Digital Input Shutdown
The unit is no longer able to operate and has been shut
down. Repair immediately.
13
Sensor Calibration Check
Manually monitor load temperature. Report alarm at end of
day.
(17)
Engine Failed to Crank
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
(18)
High Engine Coolant Temperature
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
(19)
Low Engine Oil Pressure
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
(20)
Engine Failed to Start
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
(21)
Cooling Cycle Check
Manually monitor load temperature. Report alarm at end of
day.
(22)
Heating Cycle Check
Manually monitor load temperature. Report alarm at end of
day.
(23)
Cooling Cycle Fault
The unit is no longer able to operate and has been shut
down. Repair immediately.
(24)
Heating Cycle Fault
The unit is no longer able to operate and has been shut
down. Repair immediately.
25
Alternator Check
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
(26)
Check Refrigeration Capacity
Manually monitor load temperature. Report alarm at end of
day.
28
Pretrip Abort
Report alarm at end of day.
29
Defrost Damper Circuit Check
If unit is shut down repair immediately. Otherwise, report
alarm at end of day.
30
Defrost Damper Stuck
If unit is shut down repair immediately. Otherwise, report
alarm at end of the day.