BoilerFaultCodesTechnical description
Fault: Gas valve assembly. Gas valve assembly not connected or it is connected incorrectly, short circuit in the cable harness
What causes this fault?
This fault occurs when the boiler's internal computer loses electrical communication with the gas valve, which is the component responsible for releasing fuel into the burner. The most common reason is a loose or damaged wiring connection between these parts, though it can also be caused by a complete electronic failure within the gas valve itself.
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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