Question about Refrigerators
Cannot disconnect the white connector from the defrost thermostat to the defrost heater need help
I have had this ref. for less than ten years and have had service out about every 24-36 months. Service tells me not to block the air flow vents and I do not. I have replaced the control panel 3x under service warranty contracts. I think I am having defrost problems and the lack of air flow over the evaporator coil. About three weeks ago, I manually defrosted the ref. and replaced the upper fan and all was good again. For the first week the ref. actually turned itself off for a few hours and drained a little into the evaporator tray. The last two weeks, the upper fan has kept running all day and all night. The lower fan has cycled on and off.
Its been three weeks and I am having problems again. I noticed the ice starting to sweat and the over temp. alarm came on this afternoon. Turned the ref. off and removed the evaporator cover and noticed the bottom 1/3 of the evaporator coil was frozen over heavy frost. I think the defrost system is not doing its job.
Question - What controls the defrost system and how do I test the system? What else could it be. PLEASE HELP!!!!
The defrost timer is not adjustable. It is usually outside the freezer compartment. The silver thing you described is probably the defrost thermostat. It should be tightly clipped to the tubing. This is what senses the actual temperature of the coil. It will not let defrost start unless coil is below 20 degrees and stops it before the timer does if the temp exceeds what it was set for. It must sense coil temp, not air temp. The defrost timer starts the cycle. and the cycle should last at least 20 minutes before the compressor comes on again. By clipping it back on you have probably fixed the problem. Why are you able to see the coils in operation? This will never work properly if the back panel is not in place. The panel is designed to direct air flow where needed.
Posted on Jul 07, 2008
Where is the defrost heater? If it is below the problem area, I don't think it is a defrost problem. This sounds like low freon. The symptoms of this are heavy frost on only part of the coils. Try deforsting with a hair dryer and putting it back together. Wait about 3 hours and look again. If there is frost only on part of the coils that is bad. The most this unit could defrost is every 4 hours, most are on 8 or 12 hour cycles. On most units the defrost timer shuts off the compressor and gives current to the defrost heater/s through the defrost thermostat. This thermostat is closed below 15 degrees and opens at a much higher temp after sensing the heat. This shuts off the heat usually before the timer and lets the water drip down where it should go. Then the timer turns the compressor back on and removes current from the defrost system. A common defrost problem is if the doors are left open for a LONG time or not shut all the way. Sometimes it causes so much ice that it can't melt with just one defrost cycle. This problem builds as if air flow is restricted it causes even more frost and gets worse. If this ever happens , just find the defrost timer and turn it very slowly click by click just until the compressor stops. Let it defrost , then do it again in about 2 hours. If it is a low freon problem there may still be a partial warrenty left sometimes the sealed system is guarenteed ror 5 - 10 years. Sometimes if it is not covered it is not worth fixing.
Posted on Jul 04, 2008
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Posted on Jan 02, 2017
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