What the manual says
Manufacturer manualForcing the burner to heating ignition power | The appliance functions at ignition power after successful ignition.
From this model's manual
Verified against the Glow Worm Easicom 24 installation & service manual, page 26.
DIY fix possible
Press the 'Back' or 'Reset' button to exit the test modeTurn the boiler off at the fused spur switch, wait 30 seconds, and turn it back onObserve if the display returns to the standard temperature reading
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