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Whirlpool Cabrio MVWC400XW making horrible high pitched grinding noise

So this washer seems to have had several issues and the noise during spin has been intermittent the entire time. I believe it might only do it on the high-speed spin. I was having several different issues, wash stopping at different points in the cycle and lid lock flashing. Capacitor-type humming and the spin cycle grinding or whine. The spin cycle seemed like it wasn't as high of an rpm as usual. It eventually evolved into only flashing lid lock and doing nothing else. I pulled the mainboard and found a bad capacitor and replaced that. I could then run a cycle but it would stop somewhere between wash and spin and flash lid lock. If it stopped at spin the clothes would still be soapy like it hadn't gone through a proper rinse cycle. I was still getting intermittent humming and the spin noise. I could then unplug it and run it on a low-speed spin to get the water out of the clothes but a high-speed spin cycle would usually result in horrible noise. I replaced the motor capacitor because when I pulled it, it didn't have any charge to release and I have attempted one cycle with the new capacitor and have not had the humming sound coming from the bottom of the washer. When it got to the spin cycle though it started making the high whine/grind noise. The clothes inside seemed like they had gone through a good rinse cycle this time though. The whine/grind did not start on the first spin, I believe it was the second spin. Also whenever I unplug the washer the noise immediately stops even though the basket is still spinning.


The error codes I was getting before the first two repairs were -

shifter fault

motor control fault

basket speed sensor fault

lid switch fault


After replacing the motor capacitor I got motor control fault on the one cycle that I pulled the plug on. Hoping something in here is a dead giveaway for someone with more experience.

Update (03/06/2021)

I have now run a few more cycles and it generally stops at spin and flashes lid lock until I unplug it. At that point, I can usually run a low spin cycle and get it to complete. It seems like I only get the grinding noise if it doesn't halt on an error in the cycle. It seems like it stops before the spin cycle because it's trying to spin the basket but can't. Also if it does make it to the spin cycle that grinding noise doesn't start until it's been spinning for a bit and I believe I heard some sort of loud click immediately before the noise started when it was at full speed.

I'm now getting just the shifter fault and motor control fault error codes. In manual test mode, all the washer functions work.

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Hi,

Don’t know the answer or the machine but did you recalibrate the machine after replacing the motor capacitor as mentioned in the W10280489 - Tech Sheet you didn’t say? (see p.5 Calibration mode for details)

Also does it pass the other test modes OK e.g. tachometer verification mode, shown in the tech sheet as well?

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The tech sheet I have doesn't have tacometer mode but I just did it and it worked. All the manual tests work. Calibration mode is not working currently. It locks the lid, hums for a second, then unlocks the lid and just sits there with lid lock flashing. Calibration mode worked fine when I first replaced the capacitor on the main board, but not since I replaced the motor capacitor. All tests in manual test mode run fine.

@Zachary Turnbull

I thought that I had linked the correct tech sheet as per this supplier's info regarding the manufacturer's part number i.e. W10280489 unless the one I linked having the "D" at the end of the number made it slightly different.

The only thing that I can suggest is to check the drive system as per p.15 (hopefully your tech sheet is the same).

If the tests are OK then this doesn't explain why it works OK in diagnostic mode but not in normal mode though.

Perhaps there was more damage to the control board than just the one faulty capacitor that you replaced.

Perhaps the software in the control board is a bit like a computer in that there is different software that is used for diagnostics and normal operation.

Maybe when it is in diagnostics mode, it just solely tests the individual functions of each section of the washer to make sure that they are working whereas in normal mode to continue with a part of the cycle may rely on correct inputs from other parts of the machine so it knows what to do. Hopefully you get what I'm trying to say.

Maybe it thinks that the tub is spinning too fast even though it isn't and the diagnostic tests prove that the spin is OK and is applying braking action to the tub therefore the grinding noise. My top loader does this when opening the lid on the spin cycle. It grinds to a halt very quickly. I think due to the way the power is supplied to the rotors I assume that it tries to reverse the direction of the rotor therefore it slows it down but the noise definitely sounds like you say - grinding. This is all conjecture on my part ;-)

Basically I'm wondering if it is a control board problem

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