We had the same exact problem. Service tech came out and diagnosed bad pressure switch, Part # W1015652. Swapped it for a $135 new one and it seems to work just fine now.
This would have been an easy fix for me to make had I known what to look for. Unplug and shut water, remove top cover, follow small diameter (1/4"?) black tube up from wash drum to where it plugs into the plastic pressure switch housing. Remove switch from its bracket, unplug wire harness and black tube, and replace.
Service tech said that this is due to using too much detergent, suds will creep up into the pressure tube from the wash drum and get into the small circuit board inside the pressure switch housing. He also recommended against using Kirkland Signature brand detergent even though it has the HE emblem on it. Best to use one of the major brands and only 1 to 1.5 tablespoons at most.
A google search for "Maytag 5000" reveals that this is a major problem because it is the 5th search result. "Maytag 5000 problems" search shows that this is the #1 problem with these washers.
Remove the 3 screws from the bottom panel. remove cover. Right in the centerfront is what aappears to be a white round control with a black ribbed hose going to it.
Put towels on your floor and turn the know counter clockwise. When you do, water will drain out. If it's more than your towel can handle, turn the knob back and replace the towel with a dry one. Again, turn clockwise until the piece unscrews from the unit.
Inside, you may find coins or other "debris". Also, look inside the hole where the piece came out from. I know someone who found a sock in there. Put it all back together and try a wash cycle. I am going to attempt this on my machine today.. I will follow up with my results.
As promised I am back. I followed my own instructions. Located the white unit. Was a little hard to turn knob as it was so tight with "mustle", it will turn until it comes all the way out. Sure enough, inside the debris catch were several coins and two small nails and some lint. It had a terrible smell. Rinse the entire white piece under hot water, turn at different angles and black water will come out. Keep doing that until draining is clear. After putting it back in, replacing the bottom front panel, I did a wash. NO MORE SUDS OR F35 CODES.
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WARNING: THIS WRITE-UP IS COMPLETELY MY OPINION BASED ON MY EXPERIMENTATION WITH THE EQUIPMENT. TRY ANY OF IT AT YOUR OWN RISK. YOU WILL BE SOLELY RESPONSIBLE FOR ALL THE CONSEQUENCES (GOOD OR BAD EITHER WAY) THAT YOU MAY REAP FROM THE MACHINE YOU WORK ON.
I made the biggest mistake of taking the whirpool WFW9600TA01 from US to India - I had been totally frustrated with the SUDS/F35 issue, absolutely as explained in the question above.
I started as a novice but feel very confident to write this solution now. There are several areas that could cause this problem. Fundamentally, as the water fills the tub, the pressure form the pressure switch is sensed. If the value is not in line with what is programmed, you get this error. This deviation in pressure value can be caused by any of the below reasons.
First and foremost thing I would do is remove (disassemble - note very carefully the assembly and the position before disassembling. You will need to reassemble in the exact same way in the exact same position) and clean all the pipes, hoses and connectors
Details:
The problem could occur because of:
1. True suds formation due to wrong soap usage (pretty often the problem) - Solution for this? - use a lot of vinegar and a few "risnse and spin" cycles with out any clothes in the washer
2. The pressure switch could have gone bad. Solution - replace the pressure switch (I would do this the last though)
3. There could be dirt collected at the water inlet. Solution remove the water inlet and clean the cup shaped strainer
4. Your outlet/drain pump (the one that pumps the water out of the washer into the drain) may have worn out, there by not draining out all the water. This will leave residual water impacting the next run. Solution replace the pump assembly
5. There may be particle collection such as coins pens, small pins etc in the darn pump inlet strainer causing the drain pump to not work properly and in turn causing SUDS/F35. Solution - remove the front of the drain pump inlet and remove the particles and restart.
6. There is a conical shaped connector connecting the outlet of the tub to the inlet of the drain pump. At one side of this connector (the broader side connecting to the tub) there is a plastic ball in it. If the ball is punctured, water may have collected in it causing it to weigh more than what it is supposed to. When the drain pump runs, the weight of this ball may counter act to not allow proper draining of the water. This residual accumulation of the water will cause SUDS/F35 in the next cycle. Solution - replace that flexible connector. Atleast drain the water from the front at the drain pump inlet, if you want the washer to work for that cycle.
7. There is a small white plastic tube at the back which runs a black tube to the pressure swtich. The assembly is pretty interesting. It is a simple insertion with the air tightness being achieved by a simple rubber gasket covering the insertable part (do not know why the design is such). After a few washes due to the vibration generated by the tub during wash, this gasket can move causing air leaks. Such air leaks do not cause any issue to the current run, but will result in a SUDS/F35 in the next run. It will remain so for al the next runs unless it is re-inserted properly. Solution for this? every time open the rear and make sure the plastic white part is pushed in well.
8. There are other reasons like the main control circulatory / mother board could have gone bad etc. You can figure if this is the problem by running the diagnostic tests for the most part - there is a good chance that only a certified technician can tell you. Solution - replace the mother board (quite stupid huh!!)
9. Finally, the steamer assembly could have gone bad - Although the manual says this, I cannot quite figure out how this would affect the pressure buildup in the tub - I do not know what to do. More than likely if you invite a technician, the person might ask you to replace this assembly.
Try everything - the net effect should be that you have plugged all air leaks. I know some expect to see water leaks at place where air leak exists. That may not be true at all. Good luck with everything.
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