Re: AHY 3300
It does sound like the timer to be honest, although I’m a little confused as to the “beeping”. The AHY3300 has a mechanical clock which would “ding” instead of “bleep” – end of sound effects.
The timer is circa £50 plus postage for this model so not too bad, but I would recommend an engineer fits it for you to be honest.
Check repairs@ for UK Whitegoods recommended engineers, if you are going to have a further probe, please disconnect the oven from the power supply 1st :zap:
Dave.