High Lockout
C7214 on Worcester Bosch CDi Classic

Your boiler's fan is failing to start up, which means the system cannot safely clear waste gases and will not allow the boiler to ignite.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Fan does not run during the start up phase – fan harness connector needs checking

What causes this fault?

This fault occurs when the boiler's control board sends a signal to the fan to start, but the fan fails to spin up to the required speed. The most common reasons are a build-up of dirt or debris seizing the fan motor, loose electrical connections, or a failure in the component's internal circuitry.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

C6View →A1View →

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