How much does it cost to fix boiler error code 55?

Typical repair cost for the boiler 55 fault is £120-200 including labour.

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Boiler Fault Code 55

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 55 appears across 5 boiler brands and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has lost its internal settings, likely after a power cut or service, and requires a professional to recalibrate the electronic controls to ensure it burns gas safely and efficiently. (As reported on Potterton Promax Ultra Combi ErP)

Pick your boiler brand for the 55 fix

Baxi 55 1 model Gledhill 55 1 model Potterton 55 2 models Sime 55 4 models Unical 55 2 models

Source

Information for the 55 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