BoilerFaultCodesYour boiler is trying to light itself but failing to detect a flame, meaning your heating and hot water will not work.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: If the neon does not extinguish go to sections 'H' & 'K'.
What causes this fault?
This fault occurs when the boiler's internal computer tries to start the combustion process but cannot confirm that a steady flame has been established. The most common reasons are that the spark isn't strong enough to light the gas, the sensors are too dirty to 'see' the flame, or the gas valve isn't opening correctly to provide fuel.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Spark at ignition electrodes neon flashing — no call-out fees, no surprises.
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