Boiler Fault Code Boiler Fault Finding 9

Also written as BOILERFAULTFINDING9 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Boiler Fault Finding 9 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 that it is becoming dangerously hot and has shut itself down to prevent damage, likely because water is not flowing through the system properly. (As reported on Grant Vortex Eco)