BoilerFaultCodesYour boiler has lost its electronic connection to the gas control valve, meaning it cannot safely release fuel to start the flame.
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 not detected
What causes this fault?
This fault occurs when the boiler's main control board loses communication with the gas valve, preventing the system from regulating the fuel supply. The most common reason is a loose or damaged wiring connection between these two components, though it can also be caused by a complete electronic failure within the gas valve itself.
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 F.41 — no call-out fees, no surprises.
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