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Old 10-18-2021, 09:14 PM   #1
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Dometic Duo-Therm trouble

So, I have two 600 series units. The rear one was always the coldest, but on our latest trip, I would not blow cool air.
Once we got back home, I went through the troubleshooting guide, but every test passed. I also switched out the capacitors, just to be sure.
When I turn it on, the fan starts normally. After a couple of minutes, the compressor buzzes for a couple of seconds, and there is a load on the electric system. Then it repeats the process a few minutes later. The compressor gets warm, but does not run. None of the tubes get hot or cold. I did the continuity test on the three leads with each other and the compressor body, as well as the overload protector.

I am no AC guy, but I can generally follow instructions to fix stuff. Since this unit has always worked very well, and does ot have a bunch of hours on it, I suspect I am just missing something. Any suggestions?
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Old 10-18-2021, 11:45 PM   #2
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Switched out to new capacitors or switched capacitors between the two?


Haven't seen my Dometic's AC but compressor capacitors have a start & run. Maybe the cap is bad.

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Old 10-19-2021, 10:18 AM   #3
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"on our latest trip, I would not blow cool air.
Once we got back home, I went through the troubleshooting guide, but every test passed."


When you tested, were you sure the compressor was starting? It may have been stalled and just hummed.

I also switched out the capacitors, just to be sure.
When I turn it on, the fan starts normally. After a couple of minutes, the compressor buzzes for a couple of seconds, and there is a load on the electric system. Then it repeats the process a few minutes later. The compressor gets warm, but does not run. None of the tubes get hot or cold.

Compressor may be stalled.
Capacitor may not be correct size.
Capacitor may not be working as needed.
Connections may not be correct.
Connection loose or not made properly.

I did the continuity test on the three leads with each other and the compressor body, as well as the overload protector.

I don't know how to troubleshoot this device. Maybe someone else?
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Old 10-19-2021, 05:39 PM   #4
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First, I put in new capacitors. When that did not fix it, I swapped the capacitors ( and the relay between the start cap and the compressor)between the good and bad units, just to be sure. It did not change anything.



The manual has a bunch of continuity checks you can do to test the compressor, and they were all fine.



The fan is sort of noisy, so I can't hear what the compressor is doing, but if I have my hand on it, when the timer tells it to start, I can feel it vibrate a bit for a coupe of seconds. It does that every two minutes or so, but will not start.



I am sort of thinking that perhaps it is not getting enough amperage, although I have tried under both shore power and generator. I guess a way to test that might be to run a 100v cord straight to the start capacitor, or at least straight to the power input of the unit, bypassing all the breakers and switches. I suppose one loose connection somewhere could show 100v where it should be, but fail under load. That is just a guess.



I know that many here would just buy a new unit, but that option is a bit harder for me. However, what I lack in disposable funds, I have in tools and mechanical skills. If replacing the compressor would be the solution, and if I could find one, I do have a big can of R-22, a vacuum pump, and a good set of tools.
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