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New GE fridge gts21scxass makes horrible high pitched whining noise
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It's the motherboard sending scrambled/distorted square waves to the evaporator motor.
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Originally Posted by: richappy  It's the motherboard sending scrambled/distorted square waves to the evaporator motor. So the issue is the motherboard rather than the evaporator motor?
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Rank: Advanced Member
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That is correct, the motor is just responding to the junk sent to it.
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so when the repair guy comes here on Monday and says "It's not a problem/i can't hear it/blah blah excuse" I should say "replace the motherboard"?
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He has not proven a thing to me or you. Best proof would be a scope on the signal to the motor. Should be a square wave that can be sychronised and viewable. I have viewed many pro. responses to this problem and they all say it's a bad motherboard. Your service guy should be loyal to his customers and not as loyal to the warranty co. It is easy to be loyal to other "parties", and I have, in the past, fallen into this trap of protectionism, but he should realize the customer loyalty he is destroying.
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So I should have him scope it? The first guy who was here just listened for a second and was like "yeah, that's normal." I was like you're the worst repairman ever, I can't even concentrate on anything when this noise is going on.
Do they bring scopes with them to housecall appointments?
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Rank: Advanced Member
Groups: Senior Expert
Joined: 9/10/2007(UTC)
Posts: 9,586
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No, never saw a scope used for refrigerators, just heat pumps. If you are a "good" servicer, you will check things with a scope to verify no problems, rather costly if a problem is overlooked, unfortunately the customer usually pays for misstakes.
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So is there anything in particular I should ask him or tell him tomorrow?
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Rank: Advanced Member
Groups: Senior Expert
Joined: 9/10/2007(UTC)
Posts: 9,586
Was thanked: 2 time(s) in 2 post(s)
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I would do a Google search and pile up the fixes that worked with a new motherboard. We here have piled up a lot of specific, verifiable data showing why a mother board is bad, like bad voltages to the fan motor. Go to the sticky above GE (GSS& PSS models) to get the voltages that should be there at the evaporator motor and compare them to what you have. Best evidence would be a scope.
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The guy just left. He said this fridge is a low end model that doesn't have a motherboard. He said the sound is coming from the compressor and not a fan. He put some insulation on some pipes but it didn't really do anything. I said "so is there anything else you can recommend besides getting a new fridge?" He said "you might want to upgrade, this is a low end model. We call them 'builder's specials" (or something like that). I made this face:  "Upgrade?" More like upgrade to another brand. He said even if they replaced the compressor it would probably make the same noise or even be louder. If it matters, the repair guy was older, probably 50s, and I know old people have reduced hearing in the upper ranges sometimes, but he did say he could hear it. I know I'm not crazy. There is no way that this is "normal." Oh, he said I could try putting a piece of carpet under the fridge, but I don't know how much that would muffle it because the sound is in the back firing rearwards, NOT on the bottom firing downward. I don't know if this helps diagnose anything, but sometimes the high pitched buzz is constant (like "eeeeeeeeeee") and sometimes it "pulses", like when you're on an airplane sitting between the two engines and they're out of sync, like waa-waa-waa-waa. It's the same frequency and pitch, but sometimes it pulses like that. *ready to jump off my balcony* Fridge Noob
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New GE fridge gts21scxass makes horrible high pitched whining noise
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