My WP Quiet Partner II will enter the cycle correctly, but when the drain motor comes on, it does not shut off. It pumps water out fine, but runs dry until I cancel the cycle. This happens on either a wash cycle or a rinse only cycle, but either way it sounds like it happens at the first engaging of the drain pump.
I agree the control board is a potential problem, but my first thought since it is not turning off the drain pump, and that is the only issue, that perhaps there is a bad sensor. Is there a sensor/switch that tells the drain pump that the water is out and stop pumping, or does it have a preset amount of drain time? I can’t tell from the tech sheet how it functions.
Update: i entered diagnostic mode and it seemed to hang up there…only got through 5 min of what the looks like should be a 16 min diagnostic cycle. I was ready to declare the control dead.
However I then performed the test described in the "checking keypad operation" section, where you disconnect the keypad ribbon, reconnect power and close the door. The drain motor ran for 2 min and shut off, and this guide says that means the control is ok. Now I am not sure where the issue really is.