Testing 3 wire Dometic Thermostat
I'm having some issues with my furnace. Air is working fine but nothing happens when I turn the furnace on (exhaust fan does not kick in but the AC fan runs). I am thinking my issue is with my three-w...
Forum Discussion
ticmjpm wrote:
thanks Doug. The roof AC fan functions as it did before when on Furnace. If in auto, it comes on when it is requesting the furnace. if in low or high, it runs constantly at the appropriate speed.
Sorry, had it backwards. Auto is for NO AC fan on furnace. Low or High if you want the AC fan to run when furnace is on. Doug
IF your AC fan runs when furnace is selected and fan set to Auto, you have a problem other than just the furnace not operating. I have never tested this, but I don't know what happens on AUTO if the AC control connections for furnace have NO 12 volt supply on the blue furnace wires .
