I am presently in Italy and I am trying to install a Honeywell CM907 thermostat to replace an existing thermostat on teh central heating system. I have removed the cover of the old thermostat and there are 3 wires, brown, blue and grey.
Can anyone advise me in what order I connect these to the A,B & C terminals on the CM907. The boiler is a combi Ferroli New Elite boiler if that makes any difference.
I connected the grey wire ( which was live when I tested it) to the A terminal on the CM907 and the blue wire to terminal B. I isolated the brown cable which was not live when I tested it. Nothing happened until I increased the temperature on the on the thermostat. As soon as I did this the fuse tripped.
I then connected the brown to terminal A and left the blue in B ( I isolated the grey wire) but nothing has happened. The fuse did not trip.
Can anyone offer any advice on the correct way to wire the CM907.
Thanks
Can anyone advise me in what order I connect these to the A,B & C terminals on the CM907. The boiler is a combi Ferroli New Elite boiler if that makes any difference.
I connected the grey wire ( which was live when I tested it) to the A terminal on the CM907 and the blue wire to terminal B. I isolated the brown cable which was not live when I tested it. Nothing happened until I increased the temperature on the on the thermostat. As soon as I did this the fuse tripped.
I then connected the brown to terminal A and left the blue in B ( I isolated the grey wire) but nothing has happened. The fuse did not trip.
Can anyone offer any advice on the correct way to wire the CM907.
Thanks
