High Lockout
C7217 on Worcester Bosch CDi Classic

Your boiler has shut down because the internal fan, which safely clears waste gases, has stopped spinning while the boiler was running.

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 has stopped during appliance operation

What causes this fault?

This fault occurs when the boiler's control system loses the signal that the fan is spinning, causing the unit to shut down for safety. The most common reason is that the fan motor has burnt out or become physically seized, though it can also be caused by a communication failure where the circuit board can no longer send power to the fan.

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.

Find a Gas Safe engineer
Search the official register →

Related fault codes

C6View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →