Low
12 on Baxi Combi Elite

Your boiler is simply performing a standard power-on self-check and is not indicating a 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 Baxi Combi 80e installation & service manual, page 57.
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 moments for the boiler to complete its start-up cycleCheck that the display returns to normal operationIf the code persists, try turning the boiler off at the fused spur for 30 seconds and turning it back on

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