Good morning , I have a customer with a GE refrigerator. The issue is that the temps in both the freezer and refrigerator are way above normal. I found that the compressor is running at the low speed. When unplugged and then plugged back in, the compressor starts out in high speed and then quickly drops to the lower speed. I have changed out main control with one from truck stock. Same issue. I am assuming that the inverter is good as it is starting the compressor. My question is, what controls the speed of the compressor other than the inverter. Where is the inverter getting the signal from? I have ruled out a thermister as both sides are warm. One other thing to mention…the refrigerator evaporator fan only runs with the door open and frost patterns on both evaporators are not complete.
Any thoughts on this issue? Has anyone else run into this problem? thanks in advance for any help.
- Don Kopecky asked 9 years ago
We had one with bad fresh food evaporator thermistor. Don’t bother to test. Passes test but fails under load. Actually, the board is using return DC voltage thru the thermister, normally 2.5 to 2.8 VDC, to determine temperature and make corrections. Resistance is something we use as a diagnostic aid, it is sometimes different when the resistor is under a load. Rule on GE thermisters: The evaporator thermister controls the defrost.The freezer thermister controls the damper and the temps in the freezer section.
We also had similar issue with a dual evaporator GE, for what it is worth, compressor running on low speed all the time. I replaced the fresh food evaporator thermistor and compressor started running at high speed once again. Sounds like the same issue you are having. If power was disconnected & reconnected, the compressor would run on high briefly and then return to low speed again with warm temps. Seems that the Fresh food thermistor is what the board is reading to change the input to compressor. That unit is still working 3 years later, revisited it again recently and was still chugging along, some units you don’t forget and surprised to see it still in the customers home! Good luck I hope this helps
- AV Repair Help answered 9 years ago
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