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CMunrock's avatar
CMunrock
Explorer
Aug 08, 2015

Why does my A/C fan on when I run the furnace?

My fifth wheel has two temp controllers. One has a digital display that controls my A/C and blower. This thermostat also controls my gas furnace. THe other thermostat is the type that I've had on...
Seeking Advice
Old-Biscuit's avatar
Old-Biscuit
Explorer III
Aug 08, 2015
Don't really understand why you have 2 thermostats....:H
1 digital and 1 analog.

Sounds like someone added the digital and didn't remove/disconnect analog


FAN setting should be in AUTO position (not ON). In ON position A/C fan is turning on when t-stat calls for furnace.
(A/C Fan can be turned ON by itself...furnace blower will only run when heat is called for)




Would be nice to see picture of these 2 thermostats

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