How much does it cost to fix boiler error code S.52?

Typical repair cost for the boiler S.52 fault is £90-250 including labour.

S.52 Low

Boiler Fault Code S.52

Also written as S52 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code S.52 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is in a waiting period because the air or flue system has detected a minor issue while trying to start up. (As reported on Vaillant Thermocompact)

Pick your boiler brand for the S.52 fix

Vaillant S.52 7 models

Source

Information for the S.52 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