Technical description
DHW request
What causes this fault?
This status occurs when the boiler detects water flowing through the domestic hot water pipework. A flow switch inside the unit senses the movement of water and signals the burner to ignite in order to heat the water for your shower or taps. It is a sign of normal operation rather than a mechanical failure.
DIY fix possible
Check that all hot water taps are fully closedEnsure there are no leaking hot water taps or dripping showersMonitor the lights; the red light should remain off and the green light will stay on while water is running
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