Viessmann gas boiler F4: what it means and when to call a pro · United Kingdom
Severity: Stop nowViessmann gas boiler error F4. The boiler failed to ignite (no flame was detected) and has locked out for safety.
Smell gas? Leave the building and call the gas emergency number: 0800 111 999
Meaning
The boiler failed to ignite (no flame was detected) and has locked out for safety.
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/B1KA, Viessmann
The repair: Boiler ignition lockout repair
Prices for repairs in United Kingdom are in GBP.
Other Viessmann codes
- Viessmann F9 The fan is faulty or is not reaching the correct speed.
- Viessmann F2 The boiler has overheated and the safety thermostat has shut it down.
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.