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Viessmann Vitodens 050-W fault codes

7 codes from the Viessmann manual for the Vitodens 050-W gas boiler. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
52Short circuit, flow sensor
5ALead break, flow sensor
F4No flame signal
F8Fuel valve closes too late
F9Fan speed too low during burner start
FDBurner blocked, burner control unit fault
FFBurner blocked, burner control unit fault