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Recurring problem with the evap. coil icing/frosting over on my GE fridge - 2 years old. After manually defrosting with a hair dryer, it takes a bout a week for it to get blocked again. Checked the evap. heater - works fine. Checked for leaks in the door gaskets - could not find any. Ensured the flapper on the ice dispenser to outside was closed. Changed the motherboard - still did not solve the issue. Does the defrost thermostat act as initiator for the defrost to start, or does it act as a terminator? Reason I ask - I removed the heater and thermostat and tested together standalone. The thermostat was closed, even at room ambient and the heater is energized. Yet, if the thermostat failed closed, I would expect that when the defrost relay is closed on the board, the heater would be on all the time and the evap. wouldn't ice over. Maybe I'm not completey understanding how the defrost system works. Any help would be appreciated. Not sure what to try next.
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The time of the defrost cycle in you refrigerator operates by the main control board in accordance with the evaporator thermistor readings. The defrost thermostat is the safety device. It should interrupt power to the heater in case of overheating. The defrost thermostat should be closed as long as it's cold. In the situation you described I would replace the evaporator thermistor (#243 on the diagram) and the defrost thermostat. - The evaporator thermistor Part number: AP3185407
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Rank: Member
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Hi Gene,
Thanks for the advice. I went ahead and ordered both parts and will keep you posted.
I noticed that none of the new parts have connectors to them. When installing, can I leave the old parts connected, and then cut the wires and wire nut on the new parts? Or could this cause a moisture issue?
Thanks for your help.
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Rank: Advanced Member
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You can splice the wires, using a plasticine as a moisture protector.
Gene.
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Rank: Member
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Hi Gene,
Installed the new thermostat and evap. thermistor this past Tuesday. Evap coil is icing up again. I'm at a loss of what to do next... :confused:
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Rank: Advanced Member
Groups: Senior Expert, Administrators
Joined: 7/19/2007(UTC)
Posts: 27,455
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How did you check the defrost heater? It should read about 22 Ohms resistance.
Gene.
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Rank: Member
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Physically took the heater it out and powered it with 120VAC. Thanks for the follow up.
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