How much does it cost to fix boiler error code 003?

Typical repair cost for the boiler 003 fault is £150-250 including labour.

003 High

Boiler Fault Code 003

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 003 appears across 2 boiler brands 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 trying to start but the flame is not catching or staying lit, so it has shut down for safety to prevent gas from escaping unburnt. (As reported on Ideal Maximiser SE)

Pick your boiler brand for the 003 fix

Ideal 003 1 model Navien 003 7 models

Source

Information for the 003 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