Bosch Washer/Dryer combo that stopped in the night on a wash/dry cycle

Thanks for coming back with the update — that’s a very useful find, and it makes good sense technically.

On these Bosch washer-dryers, if the drying fan stops, airflow through the heater/manifold is lost, the duct overheats, and the thermal cut-outs (TOCs) can trip. Once that happens, the heater is effectively disabled, so you can end up with a “dry” programme that leaves items cool and wet. The tripped kitchen breaker also fits with a motor or heater-related fault during the drying stage.

For anyone else with similar symptoms, the sensible checks are:

1. Confirm whether the fault only happens on drying If washing completes normally but drying stops, trips the electrics, or leaves laundry cold/wet, concentrate on the drying system rather than water fill or wash components.

2. Check the drying fan operation If accessible, see whether the fan actually starts and spins freely. A seized or failed fan motor will stop airflow and quickly overheat the heater duct.

3. Inspect/reset the thermal cut-outs Many Bosch units have manual reset thermal cut-outs on or near the heater manifold. If they’ve tripped, the dryer may run but produce no heat.

4. Don’t assume the first fault code is the root cause A code referring to condenser water can sometimes be a knock-on effect rather than the actual failed part.

5. Check for restrictions Blocked ducts, fluff build-up, or poor airflow can also cause overheating and repeated cut-out trips.

Always isolate the appliance from the mains before removing panels or inspecting internal parts. If there’s any doubt, or if mains electrics, heaters, or wiring need testing, it’s best left to a qualified appliance engineer.

Useful feedback — thanks for posting it.

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