My Duet washer would not start in any mode. It had lights for all modes but never would start in any of them. I unplugged unit, plugged it back in and no lights at all, just 3 beeps after hitting power button but no more lite up modes, nothing. I did notice an error code of F70 at one point. I ran the diagnostic test with an 888, c00, u01, u00,c00,n00, then all yellow lights on left side stayed on, then c00 remained on. No F codes at all.
Still would only make 3 beeps when trying to power up.
I installed the new 2 user interface boards with same results. After reading on other websites, I disconnected the 3 blue wire connection going to the lower MCU board, left it off, hit power and at least the modes light up correctly but indicator light is blinking. Should I replace the MCU board?
With seeing an F70 code, this would represent a central control unit heartbeat failure. The would be a communication issue between the user interface and the central control unit. With the issue the issue that you have it sounds like it would be the central control unit that is the issue not the motor control unit.
my washer displays a F20 code on the rinse cycle.
Answer Marco, The F20 error code indicates an issue with the water coming into the washer " F 20 - NO WATER DETECTED ENTERING MACHINE OR PRESSURE SWITCH TRIP NOT DETECTED" Since this happens at the rinse cycle you will need to check and make sure the cold water faucet is open and has plenty of water flow. Check that the fill hose, screen and valve are clean of debris and sediment. then replace the fill valve W10156253 if all's Ok.