BoilerFaultCodesYour boiler is repeatedly starting up and then losing its flame, causing the heating and hot water to become unreliable.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Frequent loss of flame
What causes this fault?
This fault occurs when the boiler successfully lights but cannot maintain a stable flame, causing the system to shut down for safety. The most common reason is a worn or dirty sensing probe that can no longer detect the fire, though it can also be caused by an inconsistent gas supply or a failing internal control board. Because the boiler keeps 'dropping' the flame, it eventually gives up and stops trying to provide heat.
This fault can be more frequent during very cold snaps if the external gas regulator or pipework is affected by freezing temperatures, leading to those inconsistent pressure drops.
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.
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A boiler cover plan would cover faults like E04 — no call-out fees, no surprises.
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