15 High

Boiler Fault Code 15

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 15 appears across 13 boiler brands and 61 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 24 models Atag 15 1 model Biasi 15 4 models Ferroli 15 3 models Glow-worm 15 8 models Grant 15 1 model Ideal 15 1 model Main 15 1 model Potterton 15 1 model Remeha 15 2 models Saunier Duval 15 8 models Vokera 15 4 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 27 April 2026