62-11389
7
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39
Alarm
NO.
Steps
Alarm/Cause
Corrective Action
54
DEFROST NOT COMPLETE
•
TRIGGER–ON: Defrost cycle did not complete within 45 minutes
•
UNIT CONTROL: Engine and standby Operation: alarm only. While this alarm is active, the Defrost
Timer will be set to initiate a defrost cycle 90 minutes (1.5 hours) of unit running time after the alarm
comes on.
•
RESET CONDITION: Auto Reset when defrost cycle is started again, or alarm may be manually
reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1
Perform Pretrip Check
Clear Active Alarm list, then run
Pretrip & check for any new alarms.
Any active alarms must be corrected and cleared
before proceeding.
2
Check For Defective Defrost Sensor Location/Correct Installation
Has sensor fallen from location?
Must be corrected to continue.
3
Check Evaporator Fan Contactors
Check that contactors are not
energized and that the contacts are
not stuck closed in defrost.
Must de-energize evaporator fan during defrost.
4
Check Evaporator Heater Current Draw
a. Check Heater amp draw at
1HTCON1 & 1HTCON2
These checks must be made with the unit operating.
Verify that all three actual amperage readings for
each component are within 10% of each other, and
are within the values shown in section 2.11.
