Re: Diplomat model 8902
Ahaaaa!
I had this problem with a microwave many many moons ago (20 odd years ago) and even got technical advice from the manufacturer who eventually decided the circuit board was managing to pick up some energy from the nearby radar at Heathrow airport. 😯
Of course i discovered the real problem when i fitted the new pcb and had the self same problem…..
It turned out to be the smoke alarm still in its packet in the cupboard above, where it had been for two years and now the low battery alarm was sounding! 😆