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Old 09-07-2014, 02:06 PM   #51
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Did you determine if you have a 13.5 or the 15k btu a/c? I thought there was some question about whether or not your rig had the correct t-stat on it since you lacked a heat pump mode.
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Old 09-07-2014, 05:25 PM   #52
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I have a 15k with heat pump with the correct t-stat. I was wrong earlier. Click image for larger version

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Old 09-07-2014, 05:26 PM   #53
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Just started it again today. No issues.


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Old 09-07-2014, 05:37 PM   #54
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I have only started my 5500 watt Onan once so while camping this weekend a storm came up and knocked the CG power off. I started the gen. and let it warm up for 10 min. then loaded it up with both A/C units TV's and coffe maker for 45 minutes and all went well no issues.
Hope yours is ok now and doesn't give you anymore issues.
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Old 09-12-2014, 07:53 PM   #55
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I have had nothing but problems with my Onan 4K since the day I got it. Had the fuel pump changed by Cummins dealer and thought the issue was resolved, but have now narrowed it down to the AC unit load on it. I can get it to run fine, but as soon as the AC load is put on it starts to surge badly and will continue to do so until it dies.

I have brought every other load up on it in the rig and it ran fine. Shut them all off and turn on the AC and the surging starts (very hard on the AC unit) when it surges down and dies.

AC works fine on any CG or home plug including a 110 circuit if kept on low. I have the 15K with heat pump unit on a 2013 3011DS. Haven't brought it in since didn't need it much this cooler summer up here but pretty much the only time I do want to use it is to run the AC so its been no good for me to even have it.

I have done the seafoam treatment, and even the remove air filter and spray it directly into the intake to clean the carburetor. The generator has about 117 hours on it... much of it troubleshooting the surging.

Very frustrating and absolutely no lack of issues with these out there on the web to pursue. Most say replace the carburetor, but I'm not so sure. Very interested in what you are learning BClemens as to a common issue with the 15K unit with heat pump and Onan Gen.
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Old 09-12-2014, 08:26 PM   #56
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Therein lies the problem. We have lots of units with no issues, so it's difficult to pinpoint a specific issue. As I said the the private message I will forward to Dometic and get their take.
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Old 09-13-2014, 08:16 AM   #57
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Do you think your gen is under sized for your unit?
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Old 09-13-2014, 08:50 AM   #58
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Quote:
Originally Posted by EXTremist View Post

AC works fine on any CG or home plug including a 110 circuit if kept on low. I have the 15K with heat pump unit on a 2013 3011DS. Haven't brought it in since didn't need it much this cooler summer up here but pretty much the only time I do want to use it is to run the AC so its been no good for me to even have it.
If the a/c is working on shore power then the Dometic unit is fine - but that can be verified with an amp meter.
A generator powering the a/c is at 50% capacity (a/c only, no converter/battery charger load or other 120 volt loads).
I suspect the generator is the problem. Do you know what voltage the generator is putting out both with load and without. The lower the output voltage the harder everything had to work (generator and air conditioner).
A generator sputtering under load is telling me a couple problems - fuel delivery/quality or intake air problems. Air intake would be the least culprit but still deserves checking.
A replaced fuel pump doesn't mean the problem doesn't happen with a new pump. Some owners have had multiple fuel pumps replaced.
The other problem would be fuel quality. There is no argument that these smaller engines hate ethanol. The higher the percentage of ethanol the worse the performance of the engine.
Ethanol is highly water absorbent so if the fuel is left to sit too long the percentage of water increases in the fuel.
Problem is, that water sort of separates and is hard to get it out of places like a carburetor bowl. It is things like running an engine at higher loads that stir up the water.

Another problem could be a fuel line restriction. Under normal loads there is sufficient fuel but under high loads the engine is starved. That was the symptom of the failed fuel pumps but it could be something as simple as a kink in the fuel line or even an obstruction inside the fuel line (a piece of rubber from the fuel hose).

Just a few things you can check

Bobby
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