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Old 10-20-2015, 10:43 AM   #1
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Onan genset fault codes

I have an Onan 5500 Marquis Gold genset in my 2007 5th wheel. I spent $ 867.00 on it prior to my last trip for a carburetor and service. It worked great on the whole trip. Now that I am back home it doesn't want to start and is giving me a fault code of 47. My manual says a fault code 47 is " Controller unable to sense ignition". I don't want to have to carry it back to that shop again as it is about 85 miles form home and high priced. Any help would be greatly appreciated.
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Old 10-20-2015, 08:32 PM   #2
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Originally Posted by lee&rita View Post
I have an Onan 5500 Marquis Gold genset in my 2007 5th wheel. I spent $ 867.00 on it prior to my last trip for a carburetor and service. It worked great on the whole trip. Now that I am back home it doesn't want to start and is giving me a fault code of 47. My manual says a fault code 47 is " Controller unable to sense ignition". I don't want to have to carry it back to that shop again as it is about 85 miles form home and high priced. Any help would be greatly appreciated.
Contact Cummins and see if you can order a service manual. You may simply have a loose or corroded connection, or bad ground.
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Old 10-20-2015, 08:44 PM   #3
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Here's the manual....

http://power.cummins.com/sites/defau.../F-1123-EN.pdf
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Old 10-21-2015, 09:04 AM   #4
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Onan fault code

Thanks I will look at that service manual.
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Old 10-22-2015, 07:51 AM   #5
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This is a great resource. I hope everyone in this thread downloads a copy. Will come in handy helping folks, if not ones self, in the future.
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Old 11-02-2015, 06:48 PM   #6
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Fault Codes for Onan genset

Thanks to everyone who posted back to me on this topic. I have traded my 5th wheel for a motorhome so problem solved for now.
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Old 11-02-2015, 09:49 PM   #7
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Thanks to everyone who posted back to me on this topic. I have traded my 5th wheel for a motorhome so problem solved for now.
HaHa...Well that's one way to solve the problem.
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Old 11-03-2015, 06:52 AM   #8
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The RV Generator Handbook linked above is a very handy manual, but it is NOT the "service manual" for the 5500 or any other Onan. The service manuals provide much more detail and diagnostic help specific to a model.

One inexpensive source for Onan service manuals is Ebay. The manuals for most Onan models are available on CD for around $10 or in paper for around $15. See Onan Generator Manuals | eBay
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Old 11-03-2015, 07:57 AM   #9
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Thanks to everyone who posted back to me on this topic. I have traded my 5th wheel for a motorhome so problem solved for now.
Now, that is the way to fix a problem problem! I kinda did the same thing when I bought this rig. Only difference was we had more issues than time to fix them and be able to still be on the road. Welcome the the land of coach RVing! You will now be learning how to deal with a whole new set of pleasures and problems. I do hope you have many more of the first and few of the latter.

Happy trails,
Rick Y
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