This machine is intermittently stopping anywhere mid-cycle with the door lock light staying on. If the customer turns the selector to ‘off’ , leaving it for a few seconds and then turning it back on again it carries on [from where it left off she tells me] and finishes the cycle.
I went out to it a few weeks ago when this started , checked the door lock , played with the connections on the main pcb at the bottom and it was ok for a while but has started playing up again. Is there anything this could be apart from faulty pcb, poor edge connections or door lock? Insulation resistance was ok last time I went. Are these machines susceptible to slightly reduced insulation resistance on the heater or motor? Machine is 4 yrs old.