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Old 07-19-2021, 01:50 PM   #1
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Roof Air

I have a 2006 Sunline T299SR Solaris and the roof air conditioner is kicking in and out,what would cause that to happen?
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Old 07-19-2021, 03:57 PM   #2
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Hi,

When you say kicking in and out, do you mean only the compressor or the entire fan and compressor kicks on and off constantly?

Trying to better understand as it sort of means two different causes pending if it is compressor only or the entire AC unit goes on and off.

Is the unit on Hi or Lo?

Are you still on the original Dometic thermostat or have you upgraded to a digital thermostat, and if so what brand and model?

Hope this helps

John
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Old 07-19-2021, 04:17 PM   #3
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Hello John,the unit with the fan on auto will click on and off,both fan and compressor,with the the on the set to on it will stay on,the thermostat is newer and has a heat strip as well. I turned it all way down to 40 degrees and it would come on but then turn on and off.
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Old 07-19-2021, 04:41 PM   #4
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H’mm.

First off, need to confirm you still have the original 2006 roof unit and the analog control box up in the ceiling above the white grate. If this is a yes, then

The problem points to the analog control box is getting an AC run signal from the T stat. Or the wire from the T sat up to the analog control box is skinned and wiggling on and off. A mouse chew event?

I would first start at the T sat. It may have an issue or a loose connection.


What brand and model is the new T sat?

To test if it is the T stat is the issue, you can jump the ac run signal at the T stat terminal block. It should run non stop. Not knowing what you have, I can’t confirmed which 2 wires to jump. Got any pics of the t sat terminal strip?
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Old 07-19-2021, 05:14 PM   #5
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The trailer is at my property up north so I’m back home now 250 miles away, I’ll make sure I get more details next time I get back up there, thanks for your help, I’ll let you know later when I take some pictures..
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Old 07-19-2021, 05:34 PM   #6
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This may help,

Here is the original Dometic T stat that would of come in your Sunline



A zoom in so you can see the original wire colors


And here is the original wiring diagram.


Remove your new thermostat from the wall plate so it exposes the terminals. Look at the original wire colors on the cable on the wall on the terminal strip.

If you jumper the yellow (cool) wire to the green (GND) wire coming out of the wall, and the 12 volts DC and the 120 VAC are supplied to the camper, the AC unit should start running and not stop until you unhook the jumper. Just jump from your terminals on the new T stat, no need to remove the wires. The fan may be in high or low mode, I can't recall which is the default. I think it is low mode with no contact made on Hi fan terminal (blue) but it should still run to confirm the issue is with the T stat, or elsewhere.

On this older Dometic system the controls are in the sink configuration. Meaning, the controls are looking for a ground potential and not a source, positive potential to trigger the on signal. This means, you jump the control wires to the GND terminal to make them change state.

The newer home T stats upgrades used in the campers, if that is what you are using, use Rc and Rh which on your camper most likely would be jumped together and the green GND wire attached. The yellow cool wire then goes on the cool terminal.

Hope this helps

John
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Old 07-19-2021, 05:52 PM   #7
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Quote:
Originally Posted by Dwntwn View Post
The trailer is at my property up north so I’m back home now 250 miles away, I’ll make sure I get more details next time I get back up there, thanks for your help, I’ll let you know later when I take some pictures..

OK, my last post should help on how to jump start the AC to run all the time. If it does run all the time, then the T stat has some issue.

If the AC is still going on an off with the jumped condition, next is the wire bundle in the wall between the T stat and up in the ceiling going to the analog control box.

That bundle up in the ceiling will look like this. That multi conductor cable from the T stat to the control box is wire nutted to a pigtail of wires coming out of the control box. You can jump the yellow wire there too to test if the cable is goofed in the wall.


AS FYI, the 2 conductor brown cable going to the blue striped wires on the control box are an interlock with the furnace. They should not be part of this problem.

If that the jump direct at the control box still has the on off running, then the problem with the cable ruled out, at least for the moment. Then the AC control board could be going bad. It looks like this inside the control box


Take good pics of what you have and a picture on the label of the control box if that comes to be the issue. This sticker, yours may be a little different number due to the heat strip.




The control board is still available or was in 2019 when I bought one for friends camper I helped him with. We would need your part numbers on the control box to make sure we get the right one.

Hope this helps and let is know how you make out

John
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