What the manual says
Manufacturer manualWaiting cycle: lack of water in the installation/temperature rise between heating flow and return is too high.
From this model's manual
Verified against the Glow Worm Easicom 24 installation & service manual, page 25.
DIY fix possible
Check the pressure gauge on the front of the boiler; if it is below 1 bar, top up the pressure using the filling loopEnsure all radiator valves are fully openCheck your radiators for air and bleed them if they feel cold at the top
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