Low
29 on Potterton Performa 28i

Your boiler is simply performing its initial startup sequence and is not currently reporting a functional fault.

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

Power On

From this model's manual
Verified against the Potterton Performa 28i installation & service manual, page 6.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Wait a few minutes to see if the boiler transitions to normal operationIf the boiler remains stuck on this code, turn the power off at the fused spurWait 30 seconds and turn the power back on to perform a manual reset

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