BoilerFaultCodes 07, 09 High
Boiler Fault Code 07, 09
Also written as 0709 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 07, 09 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected a problem with the burner and has shut itself down as a safety precaution, meaning you will not have any heating or hot water. (As reported on Viessmann Vitorond 100)
Pick your boiler brand for the 07, 09 fix
Source
Information for the 07, 09 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026