How much does it cost to fix boiler error code S.53?

Typical repair cost for the boiler S.53 fault is £90-180 including labour.

S.53 Medium

Boiler Fault Code S.53

Also written as S53 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code S.53 appears across 3 boiler brands and 62 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has temporarily paused because the water temperature is rising too quickly or unevenly, suggesting a circulation issue or a sensor fault. (As reported on Glow-worm Ultracom 24cx 30cx)

Pick your boiler brand for the S.53 fix

Glow-worm S.53 12 models Heatline S.53 8 models Vaillant S.53 42 models

Source

Information for the S.53 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