BoilerFaultCodesYour boiler is struggling to keep a flame lit after it has started, often due to an issue with the gas supply or a part that monitors the fire.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: All boilers
What causes this fault?
This fault occurs when the boiler successfully starts the burner, but then immediately loses the flame signal and shuts down. It is usually caused by a dirty or faulty sensor that can't 'see' the fire, or a gas valve that isn't providing a steady enough flow of fuel to keep the flame stable.
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 5P2 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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