BoilerFaultCodesTechnical description
Unvented Inlet Control Group
What causes this fault?
This fault occurs when the safety system detects an issue with the cold water entering your boiler's internal storage tank. It is usually caused by a failure of the inlet control valve, which manages the pressure of the incoming mains water to prevent the system from over-pressurising. If this valve becomes blocked or fails mechanically, the boiler shuts down the hot water production to prevent damage.
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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