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The frig is a GE Profile side by side model PSS26PSTA. The freezer side is working fine the frig side was up to 60F when set for 37F. I traced the problem to the fan in front of the evaporator coils not running. I tested the 12V fan and it was dead. I went to an electronics store and bought a new 12V fan and installed it it didn't work, so I tested it on the bench and it worked fine. The test meter showed 12V at the connection in side the frig so I put an Amp meter in line, the old fan was rated for 0.42A and the new is 0.37A, the Amp meter reads 2ma. So why am I not getting enough current? Please post any ideas.
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Your amprobe will not measure dc current. There is supposed to be a square wave from the motherboard, that current you could measure. Replace the motherboard AP3957581
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The amp meter I used was in series with the fan, not a just a amp probe
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You must use the fan that GE used, a regular dc fan motor will not work.
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Why it was a 12v muffin fan and I replaced it with a 12v muffin fan. The motherboard can't tell the difference.
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It must be a AP4438809, a special fan motor
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12v two wires 0.42A nothing special
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If you want it fixed, replace the evaporator fan motor and the motherboard!!
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Rank: Advanced Member
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The motherboard puts out a 12 v square wave, variable frequency, and also a dc voltage. If you tap onto the 12vdc line, you are probably overloading the motherboard and burning out some driver.
By putting in a non-standard fan motor, you may get performance for a period, but you risk failure later. If I knew the electronics involved, I could give you a more definitive answer.
Also, the variable frequency drives the evaporator fan motor faster at different periods when faster cooling is necessary. A constant velocity motor will probably confuse the motherboard computer and result in cycling interruptions of cooling in some way unknown to me.
I know you are trying to save money here, but this refrigerator will defeat you every time.
The only safe way to drive a dc fan motor is to tap into a 12 volt power source on the motherboard and hope GE has enough current margin in the supply to prevent burnout. However, you would need to stop the fan during defrost.
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