Viessmann gas boiler F9: what it means and when to call a pro · Czechia
Severity: Stop nowViessmann gas boiler error F9. The fan is faulty or is not reaching the correct speed.
Smell gas? Leave the building and call the gas emergency number: 1239
Meaning
The fan is faulty or is not reaching the correct speed.
Severity
Stop now
Stop. Switch it off and call a pro
Steps are not shown for this code because no qualified person has reviewed them yet. What is safe: switch it off and call a pro.
Source
Vitodens 100-W B1HA quick guide (fault codes), Viessmann
The repair: Boiler fan fault repair
Prices for repairs in Czechia are in CZK.
Other Viessmann codes
- Viessmann F2 The boiler has overheated and the safety thermostat has shut it down.
- Viessmann F4 The boiler failed to ignite (no flame was detected) and has locked out for safety.
Brands in our catalog for gas boiler: Ariston, Baxi, Bosch, Ferroli, Ideal, Potterton, Vaillant, Viessmann, Worcester Bosch. The same code on another brand is not in the catalog yet, and we do not guess what it means.