BoilerFaultCodes 26/36 High
Boiler Fault Code 26/36
Also written as 2636 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 26/36 appears across 1 boiler brand and 1 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 failure to ignite or a loss of flame, meaning it cannot produce heat or hot water reliably. (As reported on Grant Vortex)
Pick your boiler brand for the 26/36 fix
Source
Information for the 26/36 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