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

Typical repair cost for the boiler SF fault is £0-80 including labour.

SF Low

Boiler Fault Code SF

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code SF appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently running in a special service mode used by engineers to test its performance, and it is not actually reporting a fault. (As reported on Potterton Promax System HE Plus)

Pick your boiler brand for the SF fix

Baxi SF 1 model Potterton SF 1 model

Source

Information for the SF 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