BoilerFaultCodesIdeal -. H Fault Code
Also written as H — same fault.
The Ideal -. H fault code means: your boiler is working correctly and is currently providing heat to your radiators.. It appears on 4 Ideal models in our database.
Technical description: Unit is in operation for central heating
What causes the Ideal -. H fault?
This code appears when you turn your thermostat up and the boiler begins heating the water for your radiators. It is a status indicator rather than a fault, showing that the internal pump and burner are active to meet your heating demand. As long as your radiators are getting warm, the boiler is performing exactly as intended.
This code is most frequently seen during the autumn and winter months when households begin using their central heating regularly after the summer break.
DIY fix possible
No action is required as this is a status indicator rather than a fault.Adjust your thermostat if you wish to stop the heating.Check your programmer settings if the heating is on when you do not expect it to be.
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Gas Safe Register →Ideal models that show the -. H fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal -. H fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026