BoilerFaultCodesYour boiler is lighting up but the flame goes out straight away, preventing the system from producing heat.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The ionisation (the flame) directly extinguishes after ignition.
What causes this fault?
This fault occurs when the boiler successfully creates a flame, but the safety sensors fail to detect it, causing the system to shut down for safety. The most common reason is a dirty or worn-out sensing probe that can no longer 'see' the fire, or an issue with the gas valve not providing a steady enough flow to maintain the flame.
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 6H — no call-out fees, no surprises.
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Ideal Maximiser SE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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