BoilerFaultCodesWhat the manual says
Manufacturer manualFlame Loss
What causes this fault?
This fault occurs when the boiler's control board loses the signal that a flame is present, causing the system to shut down for safety. It is typically caused by a blockage in the condensate drainage pipe, a faulty gas valve, or worn-out ignition components that can no longer detect or sustain a steady flame.
This fault is frequently seen during freezing winter spells, as a frozen external condensate pipe can cause water to back up into the boiler and extinguish the flame.
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 Fn: no call-out fees, no surprise bills.
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