BoilerFaultCodesTechnical description
Gas valve shut off delay error
What causes this fault?
This fault occurs when the boiler's control system detects that gas is still present or the valve hasn't fully closed after the flame should have gone out. The most common reason is a mechanical stickiness within the gas valve itself or a communication error from the main circuit board. Because this involves the flow of gas, the boiler shuts down immediately as a critical safety precaution.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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