BoilerFaultCodes d.149 High
Boiler Fault Code d.149
Also written as D149 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code d.149 appears across 1 boiler brand and 2 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 that water is not moving around the system correctly, which is preventing it from heating your home safely. (As reported on Glow-worm MicraCom)
Pick your boiler brand for the d.149 fix
Source
Information for the d.149 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