We woke up this morning to discover that the furnace hasn't come on and,
after some investigation, I'm unable to determine why, so I thought I ask
the experts in this group to provide whatever insight they have.
Furnace is approximately 7 years old, manufactured by Payne (Model PG8,
manufactured in 1998 according to the serial number). Thermostat is a
Honeywell Programmable. Problem was noticed when we realized that the
thermostat was not showing any information and had no power to it.
What I've done:
Checked circuit breaker to Furnace. No circuit breakers in the panel were
blown and resetting the circuit breaker didn't change anything. I don't
have anything to check the power line to the furnace, other than a
multi-meter and I'm reluctant to use that to test for 120 VAC.
I pulled the cover off the thermostat and checked for the presence of 24 VAC
between the Red wire and the Common wire (blue wire). No indication of any
Checked where the wire goes from the furnace to the thermostat, looking for
24 VAC between the Common wire and the Red wire. No indication of power.
Pulled the main cover off the furnace and after taping the blower door
switch down, checked for 24 VAC on the control module. No indication of
Check the 3amp fuse on the control module board. Looked good and
multi-meter confirmed this.
At this point I'm at a loss with what to do next. My guess is that the
control module is blown or the transformer is not working. Can anyone
suggest anything else I could do before Monday, when I'll hopefully have a
heating guy come out?