Emergency
F7 on Worcester Bosch CDi RSF

Your boiler’s internal safety sensor thinks a flame is present even though it is supposed to be switched off, which has caused the system to shut down to prevent a dangerous situation.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description

Flame detected when the appliance is off

Engineer required

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

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