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

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

SL Low

Boiler Fault Code SL

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code SL appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is not actually broken; it is currently in a manual service mode used by engineers to test the system or displays a history of recent issues. (As reported on Ideal Logic Combi ESP1)

Pick your boiler brand for the SL fix

Ideal SL 5 models

Source

Information for the SL 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