What the manual says
Manufacturer manualNoheatingdemand:Summermode,eBUScontrol,waitingperiod
From this model's manual
Verified against the Glow Worm Energy7 Regular installation & service manual, page 40.
DIY fix possible
Check your room thermostat or smart controller settings to ensure the target temperature is set higher than the current room temperature.Verify that your heating timer or programmer is currently set to an 'ON' period.If you have a hot water cylinder, check that the hot water thermostat is not already satisfied.
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