Furnance fans comes on for no reason

[breeves2245]

Thermostat has been off for two days. Out of the blue, the fan comes on. I cycle through the thermostat to turn it off again. Still on.

I pulled the fuse to stop it. Is this a thermostat issue?

[chuckster57]

More information is needed. In command?

[breeves2245]

Don't know what In Command is, so I guess I don't have it. 2021 Passport SL 229RK.

It's a very standard looking thermostat. Only has Mode/Fan and temp +/- controls.

[sourdough]

Different brands/types of thermostats in different trailers. What type of heating/cooling system do you have AND brand of thermostat? More specific info is required for a decent response.

[breeves2245]

The AC is a GE Model ARC15AACBL2. Not sure how to tell what model the thermostat is, can't see any info on it and don't have a separate owners manual. So I added a pic.

[chuckster57]

This may help:

https://products.geappliances.com/Ma...-5000400-2.pdf

[breeves2245]

Thanks, I saved it in my file. I posted on another board the same question and one poster asked if it's been raining. It's been raining all day.

I'll just pull the fuse for now so I can sleep and see if my five hour drive will dry out anything if that is the cause.

[ChuckS]

Install manual for that GE A/C unit...

https://products.geappliances.com/Ma...-5000406-5.pdf

look at page 16 to see how the thermostat is wired to the roof A/C unit... you either have water that has gotten into the Roof A/C control board and shorted out the connections thus turning on the fan, a bad thermostat or bad control board.