BoilerFaultCodes 15 High
Boiler Fault Code 15
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 15 appears across 19 boiler brands and 107 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is unable to correctly control the supply of gas it needs to create a flame, causing the system to shut down for safety. (As reported on Glow-worm Xtrafast 96 120)
Pick your boiler brand for the 15 fix
Alpha 15 25 models Atag 15 1 model Baxi 15 14 models Biasi 15 4 models Ferroli 15 4 models Firebird 15 1 model Gledhill 15 1 model Glow-worm 15 11 models Grant 15 1 model Heatline 15 3 models Ideal 15 7 models Main 15 4 models Potterton 15 7 models Remeha 15 1 model Saunier Duval 15 8 models Sime 15 4 models Unical 15 2 models Vokera 15 6 models Worcester Bosch 15 3 models
Source
Information for the 15 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