Viessmann · Vitodens 100-W heat-only
50 boiler fault code
Vitodens 100-W type B1GA heat-only
Get a Gas Safe engineer
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Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
What 50 means
Flue-gas temperature sensor short circuit.
Safe check
Read and note code 50 and visible display indicators. Do not inspect the flue or access sensor wiring.
When to contact an engineer
Arrange a qualified heating engineer to diagnose the sensor and internal electrical circuit.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Vitodens 100-W heat-only type B1GA · 6194585 GB
installation and service instructions
03/2023 · document 6194585 GB