Webasto Furnace: “F10”
danger RV furnace fault codes
What it means
Overheating - the heater exceeded its safe temperature limit and the overheat protection tripped. The unit shuts down to prevent damage and fire risk.
Most likely causes
- Restricted hot-air flow: closed/blocked outlet, kinked or crushed ducting most likely
- Excessive back-pressure / high pressure loss in the air ducting common
- Fouled or failing blow-out (overheat) temperature sensor less common
- Combustion or fuel fault driving temperature too high less common
Safe checks you can do yourself
- Make sure all warm-air outlets are open and unobstructed.
- Check the full length of the hot-air ducting for kinks, crushing, or blockage.
- Confirm the air intake to the heater is not blocked.
- Let the heater cool fully before restarting.
How to reset / clear F10
- Clear the airflow restriction.
- Allow the heater to cool down completely.
- Switch the heater off and then on again; clear any lock-out with the fuse-pull reset.
When to call a technician
If airflow is unobstructed and the heater still overheats, or it has locked out, have the overheat/blow-out sensor and combustion checked by a technician.
Applies to
Air Top EVO 40 · Air Top EVO 40 B (petrol) · Air Top EVO 40 D (diesel) · Air Top EVO 55 · Air Top 2000 STC
FAQ
What does Webasto Furnace code "F10" mean?
Overheating - the heater exceeded its safe temperature limit and the overheat protection tripped. The unit shuts down to prevent damage and fire risk.
How do I reset Webasto Furnace F10?
Clear the airflow restriction. Allow the heater to cool down completely. Switch the heater off and then on again; clear any lock-out with the fuse-pull reset.
What is the most common cause of F10 on a Webasto Furnace?
The most likely cause is restricted hot-air flow: closed/blocked outlet, kinked or crushed ducting.
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Sources
- Air Top Evo 40 / Air Top Evo 55 - Fault Codes / Troubleshooting (Fig. 503) — Section 5.4, Fault code F 10 (PC codes 06/5B/17/5C) (Butlertechnik / Webasto)
- Webasto Air Top 2000 STC Fault Error Codes — Section 5.5, F10 Heating unit overheated (Butlertechnik / Webasto)
Note: On the 2000 STC a separate gradient-overheat protection is logged as hex 17 / F (gradient exceedance). EVO groups blow-out sensor and PCB temperature-sensor overheat under F10.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.