How much does it cost to fix boiler error code 15/26?

Typical repair cost for the boiler 15/26 fault is £150-300 including labour.

15/26 High

Boiler Fault Code 15/26

Also written as 1526 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 15/26 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 during operation, meaning it cannot safely produce heat or hot water. (As reported on Grant Vortex)

Pick your boiler brand for the 15/26 fix

Grant 15/26 1 model

Source

Information for the 15/26 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