BoilerFaultCodesWhat the manual says
Manufacturer manualNo flame during start-up.
What causes this fault?
This fault occurs when the boiler's control system attempts to start a flame but fails to detect one within a safe timeframe. The most common reasons include a lack of gas supply to the unit, a worn-out ignition spark plug, or a component failure that prevents the gas valve from opening correctly.
This fault is more frequent during extreme cold snaps, as external gas meters or pipes can sometimes freeze, restricting the pressure required for the boiler to ignite.
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 F004: no call-out fees, no surprise bills.
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