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One other thing that I've just thought about. If you open the thermostat up as though you were changing the batteries, there's a little 8 pin socket on the back half and on the front half there are 8 corresponding pins. Are all of those pins going into the relevant holes on the socket?

I'm out of ideas too.

Have you tried pressing the reset button underneath to see if that clears it?

It normally shows off it thinks the batteries are low. Have you tried putting some other batteries in?

I was wondering if anyone had any suggestions about an issue I'm having at work with our central heating? We have 2 central heating zones, 1 for the offices on the ground floor and the other for underfloor heating in our ground floor stores and a small rear office. Until fairly recently we've...