John lewis JLDW1221

Here I go again, this weeks problem! As above d/washer. Turns on but the pump only comes on, pcb clicks, cuts out, pump on, clicks out…etc…. Customer just moved house, was working before, thought p/swt if carried wrong but seems ok ? Had a look at the valve which is ok, had a look at the emergency flood swt but that`s ok. Think may be pcb???? Anyone ever come across this before? The whole appliance seems very cheaply made, nasty naughty dish washer!