Heating demand light OFF High

Ferroli Heating demand light OFF Fault Code

Also written as HEATINGDEMANDLIGHTOFF — same fault.

The Ferroli Heating demand light OFF fault code means: your boiler is currently idle because it is not receiving a signal from your thermostat or timer to turn the heating on.. It appears on 1 Ferroli model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Clock or room thermostat not calling
Typical repair cost £80-150 (including labour)

DIY fix possible

Check your room thermostat is set to a temperature higher than the current room temperatureEnsure your heating timer or programme clock is correctly set to an 'ON' periodReplace the batteries in your wireless room thermostat if applicable

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Ferroli models that show the Heating demand light OFF fault code

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

Source

Ferroli Heating demand light OFF fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026