What the manual says
Manufacturer manualForcing the adjustable-power burner when heating | The appliance functions at a power adjustable from "Lo" (Lo = Pmin.) to "Hi" (Pmax.) by using buttons or after successful ignition.
From this model's manual
Verified against the Glow Worm Easicom 24 installation & service manual, page 26.
DIY fix possible
Wait approximately 15 minutes for the test mode to automatically time outSwitch the boiler off at the main power switch, wait 10 seconds, and switch it back onPress the 'reset' button to return the boiler to normal operation
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