BoilerFaultCodesWhat the manual says
Manufacturer manualPILOT LIT BUT NO MAINS GAS
What causes this fault?
This fault occurs when the boiler successfully lights its small pilot flame but fails to transfer that flame to the main burner. The most common reason is a mechanical failure within the gas valve or a faulty electronic command from the control board, preventing the main flow of gas from being released. It essentially means the ignition process has started, but the 'full' heat cannot be triggered.
This issue is more frequent during the first cold snap of autumn, as gas valve internal components can seize up after being inactive throughout the summer months.
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 53: no call-out fees, no surprise bills.
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