Bosch washer dryer not heating on the dry cycle?

Yes, lack of heat on the drying cycle is a fairly common washer dryer fault, and on a Bosch it can be caused by a few different things rather than one single “usual” part.

Before checking anything internal, isolate the appliance from the mains.

1. Check whether it washes with heat normally If the wash cycle also stays cold, the fault may be with the heater, wiring, NTC temperature sensor, or control side. If it only fails on drying, that points more towards the dryer heater circuit, thermostats, airflow problem, or a drying fan issue.

2. Make sure the drying cycle is actually being selected correctly It sounds obvious, but some combined programmes only tumble or finish with very light heat depending on settings, load size, and moisture sensing. Try a timed dry setting with a small load.

3. Check airflow and condensation system Poor airflow can stop or limit heating. Clean the pump filter, check for blockages in hoses, and make sure the machine is not overloaded. On condenser washer dryers, fluff and residue can build up internally and affect drying performance.

4. Likely component faults Common causes include an open-circuit dryer heater, faulty thermal cut-out/thermostat, failed fan motor, wiring fault, or control board relay problem. Bosch machines can also stop heating if a sensor is reading incorrectly.

5. If you’re confident with testing A continuity check on the heater and safety cut-outs can narrow it down quickly, but this involves internal electrical parts.

If there’s no obvious blockage and the wash heater works fine, I’d suspect the drying heater circuit or its safety devices first. If you’re not used to electrical testing, it’s best to get a qualified appliance engineer in. Any mains or sealed-system work should be left to a professional.

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