What the manual says
Manufacturer manualVenting the installation | The function is activated for a period of 5 minutes on the heating circuit. Make sure that the air vent is open.
From this model's manual
Verified against the Glow Worm Easicom 24 installation & service manual, page 26.
DIY fix possible
Wait for the 5-minute countdown to complete automatically.Check that the small black cap on the automatic air vent inside the boiler is slightly loose.Check your radiators for cold spots and bleed them if necessary to help remove remaining air.
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