The wiring is the basic White,Yellow, Green, Red.
The new thermostat had the following connections:
G - RC - RH - Y/0 - W/B - Y1 (A jumper wire between RC & RH came pre-installed).
I connected the wiring & ran the a/c, it worked fine. I kicked on the heat, it ran fine & cycled off but, the flue purge motor continued running after the furnace had shut off. (It never did this with the old thermostat.). I had to shut off the motor with the rocker switch on front of the furnace. I double checked all connections & they were secure & correct. I double checked that the switches on the back of the thermostat were set to "STD" as opposed to "HP" & "HG" as opposed to "HE". I ran the furnace, same thing, purge motor kept running.
I did some poking around on the net & came across several websites that said to disconnect G, & if the motor continued to run, the problem was most likely a stuck relay. I had an electrician look it over & he said he didn't think it was a stuck relay & he suggested to re-connect the old Honeywell thermostat & see if the motor continued to run. It didn't.
I assumed I had a bad thermostat. I returned the Hunter & purchased a Honeywell. I connected the new Honeywell, fired up the a/c, everything worked fine. A few minutes later, I fired up the furnace, let it run, cycle down & shut off...the purge motor continued to run.
Obviously, it wasn't the thermostat. I re-connected the old Honeywell, fired up the furnace, let it run, cycle down & shut off, the purge motor also shut off.
Can anyone shed some light on this. I'm not the most mechanical person but, something that should be simple has me stumped.