This is a very old model with an electronic defrost control. The evaporator motor runs through the heater and defrost thermostat. A few months ago I had to replace the defrost t-stat for the same symptom. Is there a way to initiate an automatic defrost cycle on this model? How can I test this ADT? Someone was supposed to have changed it several months ago
- Guest asked 7 years ago
- last edited 7 years ago
Forced Defrost , defrost can be forced to start by pressing and holding
the Alarm Off pad for 3 seconds. Program changes will be saved permanently in EEPROM and program
mode will exit to Run Mode.
Adaptive Defrost Operation; Defrost occurs after predetermined length of
compressor run hours. Compressor run time between defrosts changes, or adapts, depending upon recent
history of defrost lengths (time it takes for defrost terminator to open after defrost heater has been
turned on). • Defrost terminator opens at 48°F and closes at 15°F. • Compressor run time between defrosts (CRTD)
will be one of 3 values under normal operation:CRTD 1 (8 hours) or CRTD 2 (12 hours) or CRTD
3 (16 hours).
Hope this helps Matt Ace technician see links below
- AV Repair Help answered 7 years ago
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