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dkclifford4 · Apr 23, 2010, 07:03 PM

Both the furnace and the ac are not running although the display on the thermostat looks like it should be. I called Honeywell (the maker of the thermostat and they had me do a couple of tests and they said it was not the thermostat. Any suggestions?

Joshdta · Apr 23, 2010, 07:14 PM

Transformer, or small fuse in the furnace. Does the fan work? On the fan on position?

dkclifford4 · Apr 23, 2010, 07:43 PM

No the fan does not work when the thermostat is in the "Fan On" position. It seems like thermostat is not communication with BOTH the Furnace and the ac unit. It shows they should be running but nothing is happening with either one.

Joshdta · Apr 23, 2010, 07:47 PM

Did you check the fuse and the breaker to your furnace?

dkclifford4 · Apr 23, 2010, 07:56 PM

I checked the breaker for the furnace on the main breaker box and it was in the on position. I even switched it off for a few minutes and then back on again but nothing happened. I'm not sure what or where the fuse is in the furnace but would check if you could point me in the right direction. Would a fuse problem in the furnace make the ac not run as well?

Joshdta · Apr 23, 2010, 08:03 PM

There may be a round fuse at the switch box on the side of the furnace, follow the power wire to the unit to find it. Also in the bottom door of the furnace there should be a control board with a 3 amp car type fuse in it. Not all units have this.

dkclifford4 · Apr 23, 2010, 08:23 PM

I found a round Honeywell (the same maker as the thermostat) breaker on the furnace. How do I tell if there is a problem