BoilerFaultCodesYour boiler has stopped working because it cannot detect a stable flame, often due to a problem with the gas supply or a faulty internal sensor.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Problem on combustion feedback signal – gas pressure needs checking.
What causes this fault?
This fault occurs when the boiler's internal computer tries to light a flame but cannot detect a stable fire through its sensors. The most common reasons are a disruption in the gas supply to the house, a buildup of carbon on the sensing probe, or a mechanical failure of the gas valve that prevents the fuel from flowing correctly.
This issue is more frequent during very cold spells when external gas regulators can freeze or high demand on the local network causes a drop in gas pressure.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like E89 — 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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