BoilerFaultCodes D.187 High
Boiler Fault Code D.187
Also written as D187 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.187 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 currently in a configuration mode waiting for a technician to confirm the type of flue system installed, which prevents it from operating. (As reported on Vaillant ecoTEC Plus 832)
Pick your boiler brand for the D.187 fix
Source
Information for the D.187 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