BoilerFaultCodes D.158 High
Boiler Fault Code D.158
Also written as D158 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.158 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble balancing the mixture of gas and air needed to burn fuel efficiently, which prevents it from firing up correctly. (As reported on Vaillant ecoTEC Plus 832)
Pick your boiler brand for the D.158 fix
Source
Information for the D.158 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 7 July 2026