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Old 07-20-2019, 11:55 PM   #1
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Air Conditioner -- Fan doesn't shut off

Hello all. We have a 2012 Surveyor Select travel trailer. The air conditioner turns on and cools the camper down just fine. Problem is that, even when the thermostat is set on "auto" for the fan, it never shuts off. Was a major problem when we were up in the mountains and it was cold at night. Turned on the heater and the air conditioner fan was still blowing.

Is this as simple as replacing the thermostat?

Thanks
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Old 07-21-2019, 05:53 AM   #2
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Do you here the compresor kick on and off?
If so everything's working propperly.
2012 new to you ?
Fans always run unless it's a central a/c unit like in a house
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Old 07-21-2019, 08:39 AM   #3
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Does it have high/low fan speed. If so try one of them on fan speed side then go to AC and see if it shuts down.
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Old 07-21-2019, 10:44 AM   #4
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Originally Posted by BigRedBill View Post
Hello all. We have a 2012 Surveyor Select travel trailer. The air conditioner turns on and cools the camper down just fine. Problem is that, even when the thermostat is set on "auto" for the fan, it never shuts off. Was a major problem when we were up in the mountains and it was cold at night. Turned on the heater and the air conditioner fan was still blowing.

Is this as simple as replacing the thermostat?

Thanks
One of my Machs digital controllers failed opposite that. The fan would stop but the compressor would stay running. I just swapped back to the analog wall controller and it's fine.
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Old 07-21-2019, 10:48 AM   #5
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AC is set to auto, what is the fan set at. It needs to be auto also.
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Old 07-21-2019, 11:14 AM   #6
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I have the opposite problem. my a/c does not run on auto and will only work on high. I have an appointment for tue to have a tech look at it. dometic customer serive told me it prob a control board issue.
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Old 07-21-2019, 02:10 PM   #7
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Do you here the compresor kick on and off?
If so everything's working propperly.
2012 new to you ?
Fans always run unless it's a central a/c unit like in a house

Not new to me. We bought it new and just started experiencing the problem. The compressor turns on -- blows out cold air. It just doesn't shut off. If you turn the heat on instead, the furnace blows hot air out of the floor vents and the air unit's fan is blowing cold air out of the ceiling.
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Old 07-21-2019, 02:39 PM   #8
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Not new to me. We bought it new and just started experiencing the problem. The compressor turns on -- blows out cold air. It just doesn't shut off. If you turn the heat on instead, the furnace blows hot air out of the floor vents and the air unit's fan is blowing cold air out of the ceiling.
Set your thermostat to auto, then when you use the heat the ceiling fan won't run to circulate the air.
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Old 07-21-2019, 04:40 PM   #9
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Is that a factory thermostat? Many times folks upgrade to a residential style digital unit and the switchology is different, the common outcome can be pretty much what you described.
Some folks get around this by adding an extra toggle switch, but I find it easier just to change over to a Dometic/Coleman factory digital thermostat.
No idea if this applies to your case, but worth checking out.
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Old 07-22-2019, 11:29 AM   #10
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Has it always done this? Thermostat could be wired incorrectly, or the thermostat switching contacts are bad.
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Old 07-22-2019, 11:34 AM   #11
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See page 7 on Fan settings.
Attached Files
File Type: pdf Dometic Thermosat.pdf (1.40 MB, 11 views)
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