C0
FAULT CODE
Ideal
Fan Fault — Fan Not Running
High Severity
Engineer Required
The fan has failed to start or is not reaching operating speed. C0 is a lockout version of the fan fault.
Step-by-Step Fix Guide
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Step 1
Turn off the boiler
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Step 2
Do not attempt fan repairs yourself
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Step 3 Engineer only
Call a Gas Safe engineer to test the fan motor, wiring, and PCB fan control
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.