BoilerFaultCodesYour boiler has detected an internal communication error with the part that controls the gas supply, meaning it cannot ignite safely to provide heat or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Gas valve command fault.
What causes this fault?
This fault occurs when the boiler's main control board loses the ability to properly communicate with the gas valve that regulates fuel flow. It is typically caused by a loose internal connection, a failing circuit board, or a mechanical breakdown within the gas valve itself, preventing the system from safely releasing gas for ignition.
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 E15 — 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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