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Old 02-19-2019, 09:03 AM   #1
pm1pkr
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A/C blows cold air when furnace is on

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?
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Old 02-19-2019, 09:37 AM   #2
Md.FireFighter 3791RD
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Set the fan setting on thermostat to auto.
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Old 02-19-2019, 10:15 AM   #3
K0LCB
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The most common cause is fan setting to high or low rather than auto.
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Old 02-19-2019, 04:04 PM   #4
team bradfield
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Quote:
Originally Posted by pm1pkr View Post
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.
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Old 02-19-2019, 04:08 PM   #5
DQDick
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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.
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Old 02-20-2019, 09:50 AM   #6
pm1pkr
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Smile

Thank you.
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Old 02-20-2019, 09:57 AM   #7
Md.FireFighter 3791RD
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pm1pkr,did it work for you setting it to auto.
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Old 02-20-2019, 10:03 AM   #8
pm1pkr
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Yes, it did thanks. I am trying to get used to this forum as well so maybe my response went to the wrong place.
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Old 02-20-2019, 10:13 AM   #9
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That's good now stay warm.
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