How much does it cost to fix boiler error code 4.15?

Typical repair cost for the boiler 4.15 fault is £120-£250 including labour.

4.15 Medium

Boiler Fault Code 4.15

Also written as 415 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 4.15 appears across 1 boiler brand and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is heating your radiators normally, but it is failing to provide hot water when you turn on your taps. (As reported on Ideal Logic Code Combi ESP1)

Pick your boiler brand for the 4.15 fix

Ideal 4.15 8 models

Source

Information for the 4.15 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