I have a dwf 40 dishwasher. I’ve recently changed the inlet valve due to water being found in tub very morning. In doing this I turned the machine upside down. On restarting machine I put it through its test programme. It failed this with error codes being displayed, 1 + 3 flashing. Book says the possible causes are Circulation Pump, capacitor, filters blocked, pressure sensor.
Circulation system including pump is ok, as water is being delivered and sprayed around tub.
I have noticed that just before the fault occurs, I opened door and the tub is very full of water before it drains off.
I believe it is the pressure switch or sensor. Is there a way of testing this system?