Viessmann · Vitodens 100-W heat-only
59 boiler fault code
Vitodens 100-W type B1GA heat-only
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What 59 means
Undervoltage or power-supply fault; the burner is locked out, so there is no heating or domestic hot water.
Safe check
Read and note code 59 and visible display indicators, including any obvious wider household power interruption. Do not touch boiler wiring.
When to contact an engineer
If code 59 remains after external household power is restored, arrange a qualified heating engineer to check the boiler power supply and internal electrical system.
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