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Vax Vacuummodel #X3

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F21 error on Kenmore Elite HE5t washer

Running a simple rinse cycle, the washer pumps water out of the drain, and then the pump continues to run for 8 minutes until the F21 error is displayed. I've even poured a fixed amount of water into the washer, run the shortest rinse cycle, and the same amount of water then gets pumped out (within a few seconds), but the pump never shuts off until F21 shows up. No issues previously w/ this unit. I've done the following: > Checked the drain hoses into and out of the pump, as well as out the back of the washer - no obstructions. > Checked all wiring harnesses and connections - all appear to be seated properly. > Opened and cleaned the drain pump filter - there was a small amount of debris, but nothing that would have blocked the flow significantly > Checked and then replaced the drain pump - I ordered a replacement and installed the new one, but the condition persists. In retrospect I think the old pump is probably fine...the new one functions identically and F21 still triggers. > Checked the water level pressure switch - it appears to be working fine. I disconnected the hose, blew into it and there was no apparent obstruction. Blowing into the switch assembly I could hear a "click" indicating that the analog switch is working (although I suppose the electrical could still be bad). > Ran a full auto diagnostic (x3) - the diagnostic runs fine until it gets into step C:06, and then the machine just powers off completely. I suspect that a sensor, switch, etc. which should be registering the end of the drain cycle is simply not doing so correctly, or maybe it's a faulty suds sensor (although I don't know why that wouldn't trigger a suds-specific error). I've read about trying to check the 11 & 14 or 21 & 22 contacts with a multimeter to verify switch functionality (in case the water level or suds sensors are malfunctioning), and I've tested those...the resistance does change (2.4 to 5.0 (multimeter on x200 setting)). I'm a mechanically savvy guy, what do I try next?

Posted October 22, 2012

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