Thanks guys. I got a GAP IIDcontrol reader, Bluetooth 3. I think it was previously for a Rangey, but i upgraded the firmware, and all works fine.
I wonder if it is the duct at top of radiator, where i have been leaning over to get to the battery connectors. I will check that in the morning first. Then i will need to see if i can find where the valves are - so some tech research
Really appreciate the help and contributions. Hopefully I can give back at some point in the future.