How much does it cost to fix boiler error code 501?

Typical repair cost for the boiler 501 fault is £100-350 including labour.

501 High

Boiler Fault Code 501

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 501 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 has tried to light several times but has failed to create a flame, meaning you currently have no heating or hot water. (As reported on Ariston Alteas One)

Pick your boiler brand for the 501 fix

Ariston 501 6 models Atag 501 2 models

Source

Information for the 501 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