AEG tumble dryer T56740 trips RCD after 8 minutes

AEG Tumble Dryer T56740 916096384 00

SHE told me on the phone – it works for 1 minute, then makes a strange prrrr noise and cuts out. Leave it for a couple of minutes and it will start again, then do the same.

Got there today and HE tells me – I’ve had a quick look at it and can’t find anything wrong, but it was working fine last night, now it’s dead.

RCD was tripped.

I checked the heater for foreign objects, continuity and insulation, checked the insulation of the motor and drain pump and visually checked the pcb – no obvious faults anywhere.

I plugged it in and ran it, pouring water down the trough and operating the level switch 3 times to check the drain pump was functioning, which it was doing nicely.
After about 8 minutes, it tripped the RCD.

I insulation checked those items again, in the freshly-tripped state of the machine, still with no obvious faults.

I’ve just downloaded the diagnostics system from the manual on Connect’s site, so I’ll be checking the diagnostics and alarms when I go back next week.

I’m suspecting one of the sensors or the pcb, but am willing to be advised otherwise, if anyone knows better.

Is there an expert on these machines out there that could point me in the direction of the suspect component, please?

Thanks,
Pigpen.