evaporator has no defrost heater, only the bottom freezer has a defrost heater and defrost timer. how does the refrigerator coils defrost? This problem of refrigerator coils freezing up only started in the pass 6 months and now happens all of the time.
Charged compressor, at first it was low. turned down thermostat. But when turned down temperature is not cold enough. thermostat set at 5 that is when icing in coils beginnings, Any thing would be helpful, Thanks Ricky
- Apache Warrior asked 7 years ago
Hello
The refrigerator evaporator on the 550 model is a gravity defrost eavaporator. This is how it works.
The temperature control sensing bulb senses the coil temperature and shuts off the compressor.
Since the refrgerator temperature is betwen 38 -42 degrees , the frost manually turns into water and goes down the drain. Why are you getting ice on your evaporator that is not defrosting ? Its because your temperature control sensing bulb is at the bottom of the evaporator and you are starved for refrigerant , or you can say a low refrigerant charge. When you have a low refrigerant charge, the coil temperature is not cold enough for the temperature control sensing bulb to shut off the compressor. Therfore the unit compressor runs non stop and builds ice at the top of the coil. The correction is fixing the refrigerant leak and you will eliminate your issue 100% . There is a 90% chance you have a leak in your evaporator, very common on this model. We have replaced hundreds of these evaporators and we have a video link below on how to replace your exact evaporator. If you have an electronic leak detector or floricent soap bubbles check for leaks in the evaporator. Matt Ace tecnician
- AV Repair Help answered 7 years ago
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