How much does it cost to fix boiler error code 104H?

Typical repair cost for the boiler 104H fault is £150-300 including labour.

104H High

Boiler Fault Code 104H

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 104H appears across 1 boiler brand and 2 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 an issue with the flame during operation, causing it to shut down for safety reasons. (As reported on Ideal Isar HE)

Pick your boiler brand for the 104H fix

Ideal 104H 2 models

Source

Information for the 104H 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