Low
Green light On continuously on Potterton Prima 30B

Your boiler is operating normally and is successfully heating your home's water or radiators.

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.

What the manual says

Manufacturer manual

Boiler has lit / Boiler firing

From this model's manual
Verified against the Potterton Prima 30b 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.

Find a Gas Safe engineer
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Avoid the next call-out bill

A cover plan would handle faults like Green light On continuously: no call-out fees, no surprise bills.

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