BoilerFaultCodesWhat the manual says
Manufacturer manualFlame goes off during operation and subsequent ignition attempts failed; Gas supply temporarily stopped, ignition transformer has spark failure, faulty earthing of appliance
What causes this fault?
This fault happens when your boiler successfully starts up but the flame unexpectedly goes out while it is running. It is usually caused by an interruption in the gas supply, a build-up of carbon on the sensing electrodes, or a blockage in the pipe that carries away waste liquids. When the boiler's internal sensors stop detecting a flame, the system shuts down as a safety precaution.
This fault is more common in freezing winter temperatures, as the external condensate pipe can freeze and cause a backup that puts the flame out.
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.
Avoid the next call-out bill
A cover plan would handle faults like F.29: no call-out fees, no surprise bills.
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