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Ideal icons boiler display panel?

Hi
I have an 8 year old ideal icons he24 conventional boiler.
I have come to light it but the display panel shows Dash with a dot below it.
There are no other letters displayed
Richard willetts, July 2017
You havent stated if the boiler still fires up to give heating & hot water

-° indicates communication failure between pcb & user control panel

Could be pcb
Could be user control panel
Or could be both

Asbestos, August 2017
https://www.diynot.com/diy/threads/ideal-icos-he24-control-panel-fault.283337/

https://www.youtube.com/watch?v=0MRa7yymutg

acp, July 2017