Ok… You have a Whirlpool Duet, Kenmore Elite, or Maytag Epic front load washer and you are now experiencing error codes F35 and SUD. Take a deep breath, relax, and read on because I’ll explain how you can determine if the CCU (Control Unit) or Analog Pressure Switch (APS) is causing your problem so you can avoid an expensive service call.

Let’s learn what happens when you turn on your washing machine. First, after some checking and adjusting of the dispenser, the CCU will open the water valve(s) and let in a known amount of water and then stop. The function of the APS is to give a voltage signal that represents the water level in your washing machine. For example, with an empty tub, the W10415587 APS will generate approximately 0.38 VDC and after the first fill it will generate approximately 0.7 VDC with no clothes in the washer. Note: if you have clothes in there, the output voltage will be lower because the clothes will absorb some of the water, so this also gives the washer an idea of ​​how big your “load” is.

There is a hose originating from the bottom of the large tub that goes up to the APS and when the water level rises it pushes air up the hose and into the pressure sensor IC inside the APS. The pressure sensor IC then senses the pressure and outputs a representative voltage that the CCU can measure to determine the water level. Note: Earlier washer models used a simple pressure switch that had only one or two set points. The advantage of APS is that it provides an accurate output based on the water level.

So… If the APS puts out a lower (or higher) voltage than the CCU expects, then it will trigger the F35 and SUD errors and the machine will try to pump out the remaining water. In my experience…from the beginning you will be able to “reset” the machine by unplugging it for 20 seconds. Plug it back in and try again. The errors will probably become more frequent, and eventually your pile of smelly laundry will grow because you won’t be able to turn on the machine!

Videos are available to help you determine if the CCU or APS is causing you a complaint. If it’s the CCU, then there is a repair kit with a step-by-step DVD that works 99% of the time where it replaces some components on the CCU circuit board.

One video shows how to check the output voltage of the APS while in the machine and see what the voltage signal is using a voltmeter, while another helpful video shows how to test the APS with a 5VDC power source on a bench. . If you determine that your W10415587 APS has failed, there’s a DVD repair kit for that too!

I highly recommend you start watching the videos so you can determine if the CCU or APS is to blame and get your machine working again!