Defrost Not Complete
refrigeration
Description
The defrost cycle did not finish within 45 minutes, and the unit alarms only while the Defrost Timer starts defrost 90 minutes later.
Activation Conditions
Defrost cycle did not complete within 45 minutes
Unit Behavior
Engine and Electric 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 Conditions
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.
Corrective Actions
1. Perform Pretrip Check - Clear Active Alarm list, then run Pretrip and 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 - Check Heater amp draw at 1HTCON1 and 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 2.10.