BoilerFaultCodesYour boiler has detected a serious problem with its internal gas system and has shut down as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Permanent fault. Problem with gas valve or defective gas/air unit.
What causes this fault?
This fault occurs when the boiler's control board detects an electrical or mechanical failure within the internal gas delivery system. The most common reason is a malfunctioning gas valve that can no longer open or close correctly, or a communication error between the valve and the main circuit board. To ensure your safety, the boiler automatically shuts down because it cannot accurately control the flow of fuel to the burner.
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 E.04 – .17 — 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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