Whirlpool F35 Error

Repairing the Whirlpool F35 Error

f35 error

It seems to come in waves. In the last month I’ve had 2 duet sports that have had the F35 error codes being thrown. The code is simple enough, “Analog pressure sensor” is what the tech guide says, saying to replace the sensor and it will fix it. The sensor connects with a small hose to thebottom of the washer and is used to detect how much water is in the washer so it knows when to stop filling, stop draining and finally to spin. If the sensor is showing that it’s full for too long it give an F35 or suds error. Whirlpool gives no test on how to test the sensor and simply says to replace it, nothing else. That’s easy for them to say when they’re selling you the parts at about $100 that may or may not fix the problem and is non returnable after installation. These are from 2 washers in Mandeville that I’ve repaired the hard way. That is to repair the control board. The boards are no longer available from the manufacturer so they basically are saying to buy a new washer. I know these customers can get more use out of their washing machines and was interested in finding a fix for this.

Since you’re reading this you’ve already found out installing a new sensor didn’t work.

IMG_2322The first washer showing the F35 error we were about to go on a 4 day weekend. I didn’t want to leave this customer without a washer for the weekend nor tell them they had to replace a machine that may have a few years left in it. Determined to know what was going on with this I explained the situation to the customer. I told him I’d keep trying if he wanted me to and I decided to pull the control board. When I did I noticed two ever so slightly popped capacitors. I tested them with my cap tester and sure enough I got nothing. I keep a stash of capacitors back at home base and thought I may have some but stopped at radio crap to see if they had any. They didn’t. But, I was able to round up some capacitors that I had laying around from one of my alien autopsy nights and install them. I brought the board back, installed it and it worked. Success! So here it is the fix to the F35 suds error.

The original capacitors were rated at 10 vdc. I think this is the problem. Appliances generally operate on 5vdc, 12vdc, and 120vac, AC and DC voltage. So if this one is operating at 5 volts it’s at 50% of it’s rated capacity all of the time. I changed them to 25 volts bringing the rated capacity factor down to 20% so I’d expect them to outlast the machine. I don’t know if that’s the case but it’s my theory, for now.

f35 error

10 Comments

  1. shopwme.ru
    January 22, 2016 Reply

    bought the pressure sensor again and this time it didn’t work. still get the f35 code. sooo i have to buy a main control panel? i only get 2-3 years out of these switches. seems it always happens after my wife runs the cleaning cycle. should i give up and buy a new washer that is not kenmore or whirlpool? our lg appliances seem to work without problems. would like to stick to some sort of american but really!!!

    • wbaumy
      January 22, 2016 Reply

      Interesting, I’ve never heard of a correlation of self clean and the pressure sensors going out.

      If you got the pressure sensor from a reputable supply company then yes, it’s time to look at the board. If you got it used off of ebay you may have gotten a bad one, don’t know. As far as brands go, they all have their own sets of problems and nothing is really trouble free any more. I would stick with a front load though if you do decide to replace it. On the new top loads I’m seeing a 2-5 year life span in the field. Factor that and price into your decision if you do want to replace it.

      As far as whirlpool goes, they really took a dive over the last 10 years. They were by far #1, now they’re just all lumped in together.

  2. Sam
    January 22, 2016 Reply

    I went to replace my capacitors, and based on what I had read online, I purchased 16v 2200uf capacitors for my whirlpool duet washing machine, but when I went I pulled out the CPU, the ones already on are 400v 47uf. I’m not sure if I should continue, or buy different ones. Any help would be appreciated.

    • Chelsea Bray
      January 22, 2016 Reply

      It may be a different model. Does the board look exactly the same as the one in the pictures?

  3. Kenmore Elite He5t Steam Washer F35 Error
    January 22, 2016 Reply

    […] Whirlpool F35 Error – The Appliance Technician – Jan 22, 2016. These are from 2 washers in Mandeville that I've repaired the hard way. The first washer showing the F35 error we were about to go on a 4 day weekend. give up and buy a new washer that is not kenmore or whirlpool? our. […]

  4. J Roach
    January 22, 2016 Reply

    After reading you article and replacing the pressure switch in our Kenmore Elite HE5t washing machine, we decided to pull the control board. Guess what we found? Both capacitors were bad, just like the pic you shared. Going to get them replaced and hopefully we will be back up and running soon. Thanks again for your blog!

  5. Tim
    January 22, 2016 Reply

    I have one of these washers and i figured out what is the main culprit of the F35 code. The pressure sensor doesn’t go bad like people say, what happens is their contacts inside the sensor between it and the board release. If you solder them it fixes the issue all together. When they first made these they were not really soldered but dry soldered which are weak. I pushed on my sensor after taking it apart and you can see where it released. I am surprised that the techs or the manufacture did not catch this. I guess the heat from the machine will heat this up and eventually crack the solder then the voltage runs out of range so the machine throws the code. If you have already fixed the main board capacitor issue, this is the fault after, it might even have something to do with them popping too. Hope this ends all the F35 codes out there.

    • Chelsea Bray
      January 22, 2016 Reply

      Interesting, I haven’t had too many problems with the “analog pressure sensor” that is not really analog at all if you ask my opinion. But if I run across this problem again I’ll check it for sure. I think I may have had 2 that were bad ever. I know they go bad, but I didn’t see many.

  6. Dave
    January 22, 2016 Reply

    Thank you for your thorough explanation. I had the SUD followed by F35. Checked all the usual stuff and replaced the analog pressure switch. The washer worked for 6 loads and now I’m seeing the same issue again. Does the fact that the new pressure switch worked for a little while lead you to believe that the problem is not with the control board? It seems that if the control board was bad, it would not work at all. Any thoughts? I used a new Whirlpool pressure switch.

    • Chelsea Bray
      January 22, 2016 Reply

      I believe capacitors can do that when they’re marginal so I’d suspect the control board is the problem. That’s really all you have left as long as there’s no wire problems.

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