Heat Pumps and Electric Heating - Heat doesn't come on after installing new thermostat

Hi,

I’ve changed our old thermostat with a new Honeywell touch screen one. After setting the new one up – our heat won’t come on when the display says it’s on. I first thought that I had blown a fuse or something (I checked that my circuit breakers hadn’t tripped), but after putting the old thermostat back onto the wall, the heating worked again. I have since re-tried and again it didn’t work with the new thermostat and worked with the old one.


Wiring for the old (working) thermostat:

Red wire - R
Blue wire - C
Yellow wire - Y
Orange wire - O
White wire - W2
Brown wire - E
Green wire - G

And here is the wiring for the new (not working) thermostat:

Red wire - R (R is joined to RC via a jumper)
Blue wire - C
Yellow wire - Y
Orange wire - W/O/B
White wire - AUX/W2
Brown wire - E
Green wire - G


One obvious difference is the R wire. On the old thermostat I only had “R”, on the new one I have “R” (heating power) and “Rc” (cooling power). The instructions that came with the thermostat say that R+Rc should be joined when there is only one transformer. (Please note I have also tried just “R” without the jumper to no avail. I have also tried our air conditioning with the jumper and it appears to be working, which is weird because it appears the red wire is working).

Any help is greatly appreciated!

Thanks

George

I've resolved it! It was the factory settings that were wrong.

under fan control, 0 is selected:

0 = Gas/oil heat (equipment controls heating fan)
1 = Electric furnace (thermostat controls heating fan)

I don’t have Gas or Oil - so I changed it to 1 and now it all works!