I have replaced the defrost heater and thermostat and I still have trouble with the unit not defrosting. Is there a way to force the control board into defrost to check/test the defrost circuit? I’m not a GE dealer so I don’t have tech support available to me like I do with Frigidaire. I own a small appliance store and have an account with Marcone and Sundberg. Can you give me any support? Thank you David Little 217-452-3219
Tony I did not find any visible spots on the board to say it is bad. I did find the polarity reversed at the outlet, so I corrected that. I did change the board however I don’t believe it is bad! Is there a way to truly test these boards so we can be a repair man and not a parts changer? Can you explain how to test these mother boards? Thanks David
- David Little asked 8 years ago
There is no easy way to test the board. You test everything else out and if everything else is good then you replace the board. Process of elimination to diagnose the board. If you have replaced the board, heater, and defrost thermostat the only thing that is left in the defrost cycle is the evaporator thermistor. This senses and tells the board when the unit needs to go into a defrost cycle. I would replace this part. I have attached a link to the part. P# WR55X10025. Its located on the top of the evaporator. I have also attached a video showing this repair. Just let us know if you need any further help. Good luck!
Hi Tony, I did not find any burnt spots or any thing visible that would say the mother board is bad! I did find the polarity reversed at the receptacle for the refrigerator and corrected that. I did change out the board, however I feel like a parts changer and not a true repair man! There should be a way to test these boards so we know if it is truly bad or not! Can you explain how to test? Thanks David
- David Little answered 8 years ago
Hi David, In most cases what you find is that the back panel of the freezer gets completely frosted over and iced up. In order to jump the heater out, you will need to follow these steps. UNPLUG THE UNIT. Access the back panel where the mother board is located, usually held on by (3) 1/4 screws. Remove the blue harness towards the bottom of the board. Put a jumper wire between the “Line” and “Defrost” (sometimes abbreviated with DEFR)… Plug the unit back in, If the heater is good, it should turn right on. (You may have to remove the back panel of the freezer on the inside to see this)… BUT before even going through all this, you best bet is to remove the board completely and take a look at the back of the board. ALOT of the times you will see a very noticeable “burnspot” right behind the large black box relay on the board. If you see this, the board will need to be replaced… Attached is a link to the part and 2 separate videos to assist you with you repair. If this solves your problem, please let me know! Any other questions, feel free to ask!
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