From Adam Hintz
The F21 error on this line of washers is the machines way of saying the water took to long to drain from the tub. This could be a problem with one of the washer parts including the drain pump itself, how the drain hose enters the stand pipe, or maybe even something is stuck somewhere in the drain system and is preventing the water from flowing properly. Not quite an emergency, but it is an indication of a problem and a problem that can lead to something bigger if not looked into.
From Old Turkey on SUD - According to the service manual there are a few possibilities
Sud - SUDS LOCK (Overdose of Detergent detected during the Wash Cycle)
The motor control unit senses a suds lock condition by analyzing the current draw on the drive motor. If “Sud” is displayed a potential suds lock is detected. This may signify a bad pump, an extra heavy load, excessive detergent, or excessive suds.
• If too much detergent was used, run the unit through a Rinse/ Spin cycle then a Normal cycle without adding any detergent. This should clear the unit of the excess detergent.
• Check the drain hose and make sure it is not plugged or kinked
• Check Wire Harness connections to the Drain Pump, Pressure Switch, and Central Control Unit (CCU)
• Check/ Clean Drain Pump Filter of foreign objects
• Check Drain Pump
• Check the Pressure Switch
• Check CCU
I'm at a complete loss I don't know what to do I've spent over $300 trying to fix the machine for $200 more I could have just bought a new one it makes me really sad because it's really not that old Sears used to be one of the best places to buy Electronics washers dryers fridge stove now they seem to be garbage throwaways after couple of years and makes you really sad because I work so hard for my money and I just don't have it to throw away every couple of years but it doesn't seem to matter who makes it anymore all manufactured by the same place and I slap different labels on them so really you're just buying the same garbage from store to store throwaways
F-21 is a Low Drain code. On an He2 washer: you need to access the lower panel. to do so, tilt the unit back and place a couple of pieces of two by 4 on the long side underneath. You will see 3 ea 1/4' panel screws. Remove those and pull the white panel down. To your right you will see a white round filter with a turning handle. This is the pump motor filter....place a small plastic container underneath and turn-remove the filter. Likely find: change, nails, bobby pins etc in it..I did. Clean it up and re-insert, put panel back and restart your unit.
Thank you for the info... I couldn't believe the amount of ancient crud that had been building up since 2009. One pair of tweezers, a pen or possibly two, bobby pens, make up utensils, coins, and a wad of lint that had clogged the filter with the aid of all the obstructions....the filter was easy to get to. We have our unit on the pedestal drawer. Just had to pop off the front panel with three sheetmetal screws. Filter was in the front center, easy access and easy re-assembly. Again, thank you for the info. Saved us a fortune....
Your resolution to the problem is Dead On! Thanks to this page, and to the people that made it possible to post a fix to this problem. Not even Advil would of got rid of this major headache...Thanks
Ok I had same error (F21) and would clean the pull out filter and it would seem to help for a while but then go back into F21 error. Well.. when I opened up the drain filter this time, there was an entire pair of underwear in the filter!!
Don’t know if these got in at the back of the drum or through the paddle holes ( we had a broken paddle and continued doing laundry until the new paddle came in). So possibly the underwear were in the line to the filter and causing intermittent problems. I cleaned the filter and put the cover back on - issue resolved.
Hope this helps someone.
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