Originally posted by MN Family
Also, I turned on the furnace recently and the air conditioner came on too! Have these things happened to anyone else?
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First time I turned on my furnace the AC fan came on. What the?....
Anyway- there is a setting on the thermostat that will run AC fan to "help" heat circulation when the heater is running and you are on ac power. This can be turned off. Personally if I
have AC power I'm not running the furnace, preferring to use a ceramic heater.
The manual for the thermostat, like many manuals, was missing from my owner's packet, I had to go find it and download it. It is on the Dometic site, here is the furnace op summary-
“Furnace” - Furnace Mode
In this mode there are 3 fan speed selections:
Lo - (LOW): The fan operates continuously at low speed.
Hi - (HIGH): The fan operates continuously at high speed.
Au - (AUTO): The fan will be OFF.
Note: If additional indoor air circulation provided by the air conditioner
is not desired during Furnace Mode of operation, select Au
(AUTO) in the Fan Mode to shut the air conditioner fan off. If Lo
(LOW) or Hi (HIGH) is selected the air conditioner fan will continue
to operate on the selected speed.