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dawgfish

Whirlpool Duet (basic) front loader rotation problem

14 posts in this topic

I have a Duet front loader basic model with out the display. It's Model WFW9150WW00. When I started working on it, it would fill properly, the motor would run and the drum would turn both ways. It would drain and turn a little faster but not spin at higher speeds. I ran diagnostics and did basic testing using volt-ohm meter. Everything checked out and my only conclusion was the Motor Control Unit (MCU). Put in new MCU and now it starts to turn and then stops. All other functions still ok. Put old MCU back in and still turns once or twice slowly then stops rotating, but water and drain continue to work. Is this the tachometer on the motor or something else?

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During diagnostics, were you able to retrieve any fault codes?

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No fault codes at any point in time. Mind you with the "no display" model I have, it's a matter of listening to the beeps and watching the LED for flashes. But, still, no faults at all.

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I'm still fighting with this. I have swapped out the MCU and the motor. Washer will agitate back and forth, drain and shift to a slightly higher speed (I'm thinking the slowest spin) but will not shft to medium or high speed spin. Can anyone offer ideas?

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Seems like something's telling the control not to engage the high speed spin.  Double check the filter at the drain pump for any restriction.  Standard pressure switch used for water level control.  Check pressure hose for damage from rubbing against the outer tub.

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Nothing in the filter. Drains quickly. Do I understand you to say that the pressure switch could be letting it reach the slow spin but not advance beyond? Is there just the one pressure switch for all water levels?

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Isn't there some models you need the front and back panel on in order to get it into high speed spin?

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Front and back panels are on with same results. The switches on the panels tested OK, but I will double check them. There is nothing blocking the water-level pressure tube, and it appears to work as water levels are achieved properly.

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Open the door and push up on the basket and check for slop in the tub bearing.  Is it making any unusual noises during spin with a load of clothes in it?

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No slop. No noise. Does not spin really. The fastest it rotates is just slightly faster than the normal wash speed, which is what I would call a "distribution speed". I worked on commercial laundry equipment years ago, and that's what we called it with the machines I worked on then.

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The tach function for the motor is in the MCU.  Check the connectors to make sure no damaged/bent contacts and check applicable harness for chaffing, etc.

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OK, to reiterate some, I have swapped out the MCU with a brand new one. I swapped out the motor and harness with used and supposedly working ones. I believe the used motor and harness currently installed are ok becuase I was having a slightly different problem before replacing the motor. The previous problem was the basket would turn just slightly and then stop abruptly. Testing the tach revealed somewhat unstable ohm readings and seemed pretty clear to be a tach problem. That problem actually showed up after I started troubleshooting. Now I'm back to the original problem as stated, it won't spin at higher speeds.

To add another test result, continuity testing of the water pressure/level switch indicates it is working properly.

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The tach readings readings should be stable when there is no motor movement. Your used motor could be faulty. What are the ohm readings of the windings and tachometer?

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No offense, but I seem to be re-stating things.

There is no issue with the motor. There was, but that has been replaced.

The MCU has been replace.

The pressure switch has been checked.

The panel switches seem to be ok.

Drum rotates both directions, water drains completely and quickly, and drum spins slightly faster but won't spin high speed.

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