Douger wrote:
I decided to replace my 6 year old digital thermostat (Honeywell), with a
new programmable thermostat (Hunter).

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.


Hi,
No trouble code from your furnace control board by way of blinking LED?