How much does it cost to fix boiler error code 600?

Typical repair cost for the boiler 600 fault is £120-250 including labour.

600 High

Boiler Fault Code 600

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 600 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 is failing to start up properly after multiple attempts. (As reported on Heatline Sargon 30)

Pick your boiler brand for the 600 fix

Heatline 600 2 models

Source

Information for the 600 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