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Old 06-06-2013, 10:39 AM   #1
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Help no a/c fan

Hi, New to this. I have a 3004 All American Sport 36CK. I have not taken this out yet. Sitting in the driveway. Plugged into an extension cord, 15amp. I know better than to try the A/C hooked up this way. But from what I have read here, if I understand correct, the fan should run in the fan on mode with the heat on. It does not. It has a Duo Therm thermostat. I'm wondering if something may be wrong? Is there anything I can check? Not taking this thing out till the end of June and don't want any surprises. Thanks
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Old 06-06-2013, 10:55 AM   #2
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You did not say if it is digiatal or analog. On the digital, you need to go to the fan mode and set it on hi or low. You do not need any other mode on to run the fan.
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Old 06-06-2013, 11:41 AM   #3
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Not digital. In the fan mode, from what I have read, with the heat on, the fan should run. Unless I'm mistaken?
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Old 06-06-2013, 02:42 PM   #4
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Not digital. In the fan mode, from what I have read, with the heat on, the fan should run. Unless I'm mistaken?
Don't try to test by using an anomaly of some thermostats. I don't think they all do that, and why would you want it to? Just turn the fan on with the normal fan mode setting.
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Old 06-06-2013, 02:55 PM   #5
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I believe that the AC fan should run by selecting On instead of Auto on the thermostat. It should also have a Hi/Lo switch.

The fan should run but the AC wouldn't start using a 15A outlet and extension cord.

I'm not sure I understand what you're trying to accomplish.

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Old 06-06-2013, 02:59 PM   #6
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Dave I "think" there trying to do what most people don't want to do or can't figure out what's happening.

Trying to run furnace and also have the a/c fan on at the same time.

Correct me if I'm wrong.


Besides I think he must have a space age prototype being a 3004.

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Old 06-07-2013, 09:12 AM   #7
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Hey guys. Maybe I'm getting ahead of myself. 3004, maybe I am. I've read posts here about the fan running in the heat mode. And replies that it will run if in the on position. Mine will not. Maybe I'm over thinking this, but I want to avoid any posslble trouble down the road. Thanks, All
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Old 06-07-2013, 09:16 AM   #8
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Did you try what I suggested...the AC fan should run when 'On' is selected regardless whether you've selected AC or Heat.

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Old 06-07-2013, 09:22 AM   #9
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Yes, I tried when the heat was on. The fan didn't run. That's the reason for my question. Thanks
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Old 06-07-2013, 09:46 AM   #10
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If you have the older style thermostat you cannot run both at the same time. A picture of the thermostat would speak volumes. At the present time we can only guess as to why you cannot run both at the same time.
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Old 06-07-2013, 09:48 AM   #11
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This is what I have and it works as op is requesting.


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Old 06-07-2013, 09:50 AM   #12
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Does your thermostat look like the one pictured in this link?

Products - Dometic

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Old 06-07-2013, 10:27 AM   #13
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SYSTEM "OFF" = FAN "ON"... SYSTEM "HEAT"= FAN "AUTO". Can't have it both ways. The heater has to control the fan due to propane as a heat source fuel. You can select fan ON or AUTO using A/C and set the fan to HI or LO for the A/C fan speed. If in AUTO for A/C the fan speed will be HI.
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Old 06-07-2013, 10:33 AM   #14
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SYSTEM "OFF" = FAN "ON"... SYSTEM "HEAT"= FAN "AUTO". Can't have it both ways. The heater has to control the fan due to propane as a heat source fuel. You can select fan ON or AUTO using A/C and set the fan to HI or LO for the A/C fan speed. If in AUTO for A/C the fan speed will be HI.
Not really sure what your getting at here.

Op wants furnace to run but also have a/c fan to run.

With the thermostat I have pictured it will work that way as we do it all the time to evenly heat the sabre.

Heat on
Fan on
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Old 06-07-2013, 02:46 PM   #15
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That is what I have. The fan won't run. Maybe getting ahead of myself. Just wanted to see if there's anything I can check. Before I try to use this thing. I'll go out tomorrow and check again. I have not tried to check it in A/C mode because I know the amprage is too low. Thanks All!
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Old 06-07-2013, 03:12 PM   #16
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Depending on the size of your AC mine is 13.5K it will run on 15 amp as long as nothing else major is on the same circuit. When I first got my camper I didn't have a 30 amp outlet outside (that has been remedied) and we would turn on the AC and sit in the camper and watch TV. Pole Barn Camping at it's finest
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Old 06-07-2013, 09:58 PM   #17
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Quote:
Originally Posted by IHDRIDER00 View Post
Hi, New to this. I have a 3004 All American Sport 36CK. I have not taken this out yet. Sitting in the driveway. Plugged into an extension cord, 15amp. I know better than to try the A/C hooked up this way. But from what I have read here, if I understand correct, the fan should run in the fan on mode with the heat on. It does not. It has a Duo Therm thermostat. I'm wondering if something may be wrong? Is there anything I can check? Not taking this thing out till the end of June and don't want any surprises. Thanks
I understand your question (I think). In 2004 Dometic and others used analog thermostats, ie you manually chose your settings with switches. Now using the Digital round dial style you can choose the run the VENT fan in the ceiling w/ AC mandatory, circulate only or with heat. The purpose with heat is to move the heated air around far more efficient than the heater fan alone. It does work well that way. Hope this clears the air! I guess you could convert to the new system?
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Old 08-04-2013, 06:54 AM   #18
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Finally got to a CG, 30 amps. everything works great. Thanks All!
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