So now I'm a bit puzzled:
You should be able to test that the system is working by turning any existing room thermostat to its maximum setting then the Wiser should work the heating.
they are wireless so can not turn them on anymore
I've just turned the new ones all the way up and can control using the old ones although obv i would rather just remove the old ones and let the new ones do the job
Glad you've got your heating on, but it should also work the other way around. Turn the old ones up full, and the new ones should control the heating.
But, are you sure that the old thermostats are wireless? They look like this to me......
......and if so, they have wiring terminals numbered 1 to 5 so definitely not wireless.
If yours are the same, to decommission one, there are three options, the first is the way the professionals would do it:
1. Trace the thermostat cable from the thermostat back to its origin.
2. When you find the origin of the cable, take take a photo, or make a note of where the wires from L (1) and NO (5) are connected.
3. Disconnect all of the wires going to the old thermostat and remove the cable and old thermostat.
4. Insert a wire link between the terminals where the two switching wires from L and NO have just been removed from, so that they are now electrically joined together.
Or, option 2. Replace the thermostat with a junction box and put the wires from L and NO together in one terminal and the wire (or wires) from N in a terminal on its own.
Or, option 3 Leave the old thermostats in situ and move the wire(s) from L and put it/them in the NO terminal with the wire already there.
Any questions, or not sure about something just post back.