Key Takeaways
- A clogged lint filter or blocked vent is the most common cause
- Check the circuit breaker — a partial trip can run the motor but not the heater
- Error code E06 indicates a heating element failure
- Overheating (E01) and no heat (E06) have different root causes
- Heat pump dryers require clean heat exchangers for proper operation
The Bottom Line
Clean the lint filter, check the exhaust vent airflow, and verify the circuit breaker before calling for service.
Why Your Bosch Dryer Isn't Heating
A Bosch dryer that tumbles but produces no heat leaves clothes damp after a full cycle. The cause is usually airflow-related — which you can check and often fix yourself — but electrical and component failures are also possible. Here's a systematic approach.
Quick Diagnosis Table
| Symptom | Error Code | Likely Cause | DIY Fix? |
|---|---|---|---|
| No heat, dryer runs | E06 | Heating element failure | No |
| Dryer overheats, shuts off | E01 | Blocked lint path | Yes — clean lint |
| Inconsistent heat | E08/E28 | Temperature sensor fault | No |
| Motor runs, no heat at all | None | Partially tripped breaker | Yes — reset breaker |
| Drying takes forever | None | Clogged vent or heat exchanger | Yes — clean vent |
Check 1: Lint Filter and Exhaust Vent
A clogged lint filter is the number one cause of dryer heating problems — and the number one cause of dryer fires. Clean the lint filter before every single load. Also clean inside the filter housing with a vacuum monthly, as fine lint accumulates around the slot. Then go outside and check the exhaust vent: you should feel strong, warm airflow when the dryer runs. If airflow is weak, the duct is blocked and needs cleaning.
Check 2: Circuit Breaker
Electric dryers (not heat pump models) use 240V from a double-pole breaker. If one pole trips, the drum motor runs on 120V but the heating element (which needs 240V) does not activate. The dryer appears to work normally except it produces no heat. Check the breaker panel — turn the dryer breaker fully OFF, then back ON.
Check 3: Heat Pump Dryer — Heat Exchanger
Bosch heat pump dryers (500 and 800 Series) don't have a traditional vent — they recirculate air through a heat exchanger. This component needs regular cleaning. Open the lower access panel, remove the heat exchanger, and rinse it under running water to remove lint buildup. A dirty heat exchanger dramatically reduces drying efficiency and can cause the dryer to take 2-3x longer than normal.
Check 4: Condensation Water Tank (E03)
On condensation and heat pump dryers, a full water tank stops the dryer. This isn't a heating issue per se, but it stops the drying cycle. Pull out the tank, empty it, replace it, and restart. Empty the tank before every load as a habit.
Repair Cost Expectations
| Repair | Typical Cost | Notes |
|---|---|---|
| Lint path cleaning (DIY) | Free | Prevents 50%+ of heating issues |
| Breaker reset (DIY) | Free | Common overlooked cause |
| Thermal fuse replacement | From $100 | Often blown due to lint buildup |
| Heating element | From $180 | Most common paid repair |
| NTC temperature sensor | From $120 | For E08/E28 errors |
| Heat pump compressor | From $400 | Major repair — evaluate age |
When to Call a Professional
If the lint path is clean, the breaker is fine, and the heat exchanger is clear — but the dryer still won't heat — the heating element (E06), thermal fuse, or temperature sensor (E08) has likely failed. A technician can test these components and replace the faulty one. On heat pump dryers, compressor issues are the most expensive repair and may warrant replacement on older units.
Prevention
Clean the lint filter before every load — no exceptions. Vacuum the filter housing monthly. Have the full exhaust duct professionally cleaned annually. On heat pump models, clean the heat exchanger every 3 months. Replace flexible foil exhaust duct with rigid metal duct — it resists lint buildup and is safer. These habits prevent the majority of Bosch dryer heating problems.