Low
17 on Baxi EcoBlue Heat

Your boiler is operating in a temporary de-aeration mode to remove air bubbles from the system and is not actually reporting 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

alternates with Boiler operating mode

From this model's manual
Verified against the Baxi Ecoblue Heat 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.

DIY fix possible

Wait for 5 to 10 minutes for the automatic venting cycle to completeEnsure all radiator valves are open to help move air through the systemCheck that the system pressure is between 1.0 and 1.5 bar on the gauge

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