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Glow-worm fault code

Glow-worm F4: Ignition failure

Safety related: do not keep resetting

What it means

Boiler did not light.

Safe things to try first

  1. Check gas supply and condensate pipe.

When to call an engineer

Gas Safe engineer for repeated lockouts.

Never remove the boiler cover or work on gas components yourself. It is illegal unless you are Gas Safe registered, and it will void your warranty.

Fix Glow-worm F4 today

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