Hi All

I'm trying to upgrade my old thermostat for a sunvic TLX 6501.

When I opened the thermostat, the wiring is
two yellow wires going to 1&2, two green/yellow earths going to 3 and two blue
common wires going to 4.

In the Sunvic box there is NO,COM and NC.

Can someone please give me some advice on what goes where?

Thanks in advance.