Following the advice/discussion elsewhere recently I bought a Honeywell Room Thermostat (CM907 -
There are 3 wires coming to it, a blue, a brown and a green/yellow. These were connected onto the old thermostat blue ---> N, brown --> L, and green/yellow --> E. (All well and good so far).
I have now fitted the new thermostat, and it all lights up and tells me the day/temp etc, and I have connected the brown to terminal A, and blue to terminal B (page 7, in the wiring diagram
I have tried replacing with a 5A fuse but the same happens. I'm loathe to try a 13A, as this is what was originally fitted and the heating engineer was upset to see a 13A fuse in it when he replaced the controller earlier this year. Also, the installation instructions say that it should be less than 8A.
So, do I call out a heating engineer (another £75) or can anyone suggest what stupid thing I'm doing wrong?
Thanks, David