A/C blows cold air when furnace is on

[pm1pkr]

I recently bought my first 5th wheel - a 2014 Montana 305RL.

I took it home and connected power to play/test. The furnace does produce warm air but the A/C blows cold air at the same time. The switch has a fan/AC/Furnace/temperature settings. I set it to furnace with the temp I want. Warm air comes out of the floor ducts but cold air comes out of the ceiling ducts as well.
Am I missing something or is this a problem?

[Md.FireFighter 3791RD]

Set the fan setting on thermostat to auto.

[K0LCB]

The most common cause is fan setting to high or low rather than auto.

[team bradfield]

Originally Posted by pm1pkr

I recently bought my first 5th wheel - a 2014 Montana 305RL.

I took it home and connected power to play/test. The furnace does produce warm air but the A/C blows cold air at the same time. The switch has a fan/AC/Furnace/temperature settings. I set it to furnace with the temp I want. Warm air comes out of the floor ducts but cold air comes out of the ceiling ducts as well.
Am I missing something or is this a problem?

Welcome to the MOC, and congratulations on your first Fiver, there is a world of knowledge most love to share. I had the same problem last year, a quick search on the MOC and problem solved.

[DQDick]

Welcome to the forum! You can use the fan on any setting to air condition, but for furnace or heat pump you need it on auto.

[pm1pkr]

Thank you.

[Md.FireFighter 3791RD]

pm1pkr,did it work for you setting it to auto.

[pm1pkr]

Yes, it did thanks. I am trying to get used to this forum as well so maybe my response went to the wrong place.

[Md.FireFighter 3791RD]

That's good now stay warm.