I think the problem was linked to a pinched cable in the loom from the panel back to the main board.
I followed the steps to remove the control panel from the unit and when I came to the part with the wiring loom, I noticed a few of the individual strands were pinched quite badly. I've unpinched them and bent the routing of the loom to ensure it doesn't happen again and the panel now works so maybe a faulty cable connection.
Thanks for the input

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