Low
30 on Main Eco

Your boiler is simply performing its normal startup routine after being switched on or restarting after a power cut.

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 Main Eco installation & service manual, page 7.
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 for the boiler to complete its internal startup sequence.If the boiler remains on this code for more than 10 minutes, turn the power off at the fused spur.Wait 30 seconds and turn the power back on to see if it clears to a normal operating temperature display.

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