High
C7 216 on Worcester Bosch 30i Junior

Your boiler's fan is not spinning fast enough to clear out exhaust fumes safely, which has caused the system to shut down for your protection.

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 speed too low – check the fan harness and connector

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 →A7View →

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