-. H Low

Boiler Fault Code -. H

Also written as H — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code -. H appears across 3 boiler brands and 13 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is working correctly and is currently providing heat to your radiators. (As reported on Ideal Maximiser SE)

Pick your boiler brand for the -. H fix

Halstead -. H 7 models Ideal -. H 4 models Worcester Bosch -. H 2 models

Source

Information for the -. H 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