h Low

Daikin h Fault Code

Also written as H — same fault.

The Daikin h fault code means: your boiler is currently operating at its maximum power level to heat your home, which is a normal status message rather than an actual fault.. It appears on 2 Daikin models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Burner on with set maximum CH power
Typical repair cost £0 (including labour)

DIY fix possible

No action is required as this is a status indicator.Wait for the house to reach the set temperature; the code will disappear once the demand decreases.Check that your room thermostat is set to your desired temperature.

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Daikin models that show the h fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Daikin h fault code information on this page is sourced and cross-checked against the official Daikin service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026