Medium
Burner On (Green) light flash on Potterton Performa SL HE 9 2

Your boiler is currently trying to light its flame, but it is taking longer than expected to successfully start up.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

Checking for burner ignition

From this model's manual
Verified against the Potterton Boiler Performa Sl He 9 2 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

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

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