What the manual says
Manufacturer manualControl panel button fault - Control panel button stuck in the on position
From this model's manual
Verified against the Alpha Intec2 25 28xe installation & service manual.
DIY fix possible
Switch off the power supply to the boiler at the fuse spur for 60 seconds.Inspect the control panel buttons to see if any are physically jammed or stuck down.Gently press each button several times to ensure they are free-moving and not trapped by dirt or housing debris.Switch the power back on to see if the error clears.
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