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Author Topic: Whirlpool WFW9470WW01 - Intermittent door lock  (Read 263 times)

Offline dude652

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Whirlpool WFW9470WW01 - Intermittent door lock
« on: December 18, 2016, 11:50:50 AM »
Washer has been having intermittent F22 door lock failures (solenoid won't fire to start cycle) and finally quit for good (I thought).  Ring out switch, seems OK, clean connections, put it back together, no dice.  Start digging around in the machine looking for wire/harness related issues (moving wire around and checking connectors, looking for anything obvious, don't see anything), give it a shot and we're running for 2-3 loads.  F22 failure again, I bite the bullet and buy a switch and replace it as I'm not sure what the solenoid resistance should be.  I check new switch vs old, both switches and both solenoids are about 160 ohms per side and 320 total, I'm thinking CCU at this point.  Put new switch in anyway, it works for a few loads and F22 again.  Ring out harness, it's OK.  Take CCU out and clean all connections (No corrosion for what it's worth), put it back in, no dice.

I turn it on this morning, hit start, solenoid fires and it's running...

I'm really at a loss with this thing, don't want to guess at the CCU at $250, anyone have any experience here? 

Offline dude652

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  • Member Since: Dec 2016
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Re: Whirlpool WFW9470WW01 - Intermittent door lock
« Reply #1 on: December 19, 2016, 01:54:17 PM »
Update:

My friends that are hobbyist circuit builders say that cap in the middle shouldn't be glued on & suggest to replace it.  This is the CCU board.  Cap looks physically OK from outside (it's not wet/leaking) and I decide to desolder anyway.  It was definitely glued/siliconed to board, but tests out dead upon removal (I may have killed it during removal, whatever they used for solder has a really high melting point).  I jumper in new cap, install in machine and it fires up...saga continues, will update.     

Offline dude652

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  • Member Since: Dec 2016
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Re: Whirlpool WFW9470WW01 - Intermittent door lock
« Reply #2 on: December 25, 2016, 02:25:20 PM »
Intermittent/random failures have continued with the door lock.  It won't fire, F22.  Does anyone have a logic diagram for these things?  I'm really at a loss here.

 

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