What the manual says
Manufacturer manualThe red flame failure neon will illuminate in the event of the burner failing to light, or when incomplete lighting of the burner occurs.
From this model's manual
Verified against the Potterton Performa 28i installation & service manual.
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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