C Low

Pro C Fault Code

The Pro C fault code means: your boiler is operating normally and is currently providing heat to your radiators.. It appears on 1 Pro model 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: CH being supplied.
Typical repair cost £0 (including labour)

DIY fix possible

No action is required as this is an operational status code rather than a fault.If your radiators are cold despite this code showing, check that your room thermostat is turned up.Ensure your radiator valves are open.

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Pro models that show the C fault code

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

Source

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

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