How much does it cost to fix Ferroli error code Heating demand light ON?

Typical repair cost for the Ferroli Heating demand light ON fault is £120-200 including labour.

Heating demand light ON High

Ferroli Heating demand light ON Fault Code

Q: What does the Ferroli Heating demand light ON fault code mean?

Your boiler is confused because a sensor that measures the temperature of your heating water has stopped sending the correct signal, so it has turned off the heating to stay safe.

Also written as HEATINGDEMANDLIGHTON — same fault.

The Ferroli Heating demand light ON fault code means: your boiler is confused because a sensor that measures the temperature of your heating water has stopped sending the correct signal, so it has turned off the heating to stay safe.. It appears on 4 Ferroli models in our database.

Technical description: C.H. sensor fault

Typical repair cost £120-200 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ferroli models that show the Heating demand light ON fault code

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

Source

Ferroli Heating demand light ON 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