How much does it cost to fix boiler error code 502?

Typical repair cost for the boiler 502 fault is £120-280 including labour.

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Boiler Fault Code 502

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 502 appears across 1 boiler brand and 1 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 a flame when there shouldn't be one, which is causing the system to lock out for safety. (As reported on Ariston Alteas One)

Pick your boiler brand for the 502 fix

Ariston 502 1 model

Source

Information for the 502 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