Re: ZANUSSI ZDT 5052
Have you checked the pump for an intermittent obstruction? Common culprit is a piece of broken glass moving in and out of the pump intake and jamming it. If the customer has broken a glass in it that could be the problem. You may miss it first time because a clear fragment is difficult to see.
Drain the machine completely and syringe or sponge the sump dry. Check with a torch and it should show up. 😉
If not, pump off job. I would not suspect the PCB in the case of a intermittent pump.
HTH,
Steve.