Bosch HM48141 Oven Problem (no power)

Dear all;

Last night our Bosch HM48141 was cooking – then suddenly went off. All power lost.

The oven is on an RCB which was not stripped.
It is hard-wired into the mains via a on/off switch.

This morning I re-cycled the on/off switch and the clock re-lit.
Turning it on, there was the sound of a fan, and small breeze. The visible fan at the back was not turning, though. Other than this, no light in the oven either.

I tried it again, and this time it tripped the RCB.

Power is now back on, and clock is lit, but that’s it.

Any thoughts?

Thanks!!