BoilerFaultCodesYour boiler has detected an internal electrical communication error between the control board and the gas valve, preventing the burner from lighting safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: No feedback from the modulating gas valve. The gas valve relay is defective – press the reset button and apply burner start, wait to see if fault reoccurs, if it does the gas valve needs replacing
What causes this fault?
This fault occurs when the boiler's main computer loses touch with the gas valve that controls the fuel flow. It is usually caused by a physical failure of the electronic relay on the control board or a malfunction within the gas valve's internal motor. Because the boiler can no longer verify if the gas is being turned on or off safely, it shuts down as a protective measure.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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