Re: Bosch Washer Dryer.
Also agree on the blockage in the condenser, I always pop the bottom hose and have a good poke with a coathanger up around the top bend to clear anything away.
Also worth checking for correct triac/pcb operation. Trip the door switch, and put the machine onto spin. Hold your hand just under the air ducting when it goes into spin and feel the air temp doesn’t rise. The dryer triac or main power pcb can cause the neutral circuit to complete and allow the dryer elements to heat which would also cause the trip to trip. I find running the spin with door open the easiest way to be sure of no electronic fault.
Just remember to untrip the door switch after this though.