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Your boiler has correctly received a signal from your thermostat or timer and is successfully starting the heating process as requested.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

Indicator lamp on the ignition board to aid electrical commissioning. Sequence when there is a call for heat.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

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