Well this forum has done it again.
We are now toastie warm.
Funny thing is that I had the comm plug disconnected from the control box earlier today and it did nothing. This time I disconnected it from the control panel waited a little and plug it back in once it came back I had no heater option only cooler. Repeated a few times from both the control panel and a control box and also unplugged to Mains to the unit. Then success all back to normal.
Bonus is without realising l've given my heater a service.
@0-TJ-0 thanks mate.
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