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Old 02-22-2013, 05:34 PM   #1
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Help, need your wisdom!! Onan Generator problems, code 31

Aloha all,

Mahalo in advance for any assistance you all can give me! I have a 2004 Fleetwood Revolution with the Freightliner chassis and an Onan diesel 7500 which is acting up.

1) Genny will shut down when load kicks in but will re-start again right away and when load comes on the genny will stall again! over and over again!
2) code 31 is stored
**** separate but possible pertinent info ****
DW states she heard an odd noise similar to tree branches in the Genny one day, she then immediately shut it down and restarted it!


Now, I need to remove the Genny and would love a play by play or at least some ideas.

many mahalos

Jack
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Old 02-22-2013, 06:23 PM   #2
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Code 31 appears to be overspeed fault. Ive reas that others have replaced the
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Old 02-22-2013, 06:25 PM   #3
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Sorry. Fat fingers. Replaced the fuel filter and fixed the code 31 problem.

Google onan generator code 31.

Good luck.
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Old 02-22-2013, 06:33 PM   #4
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Agree, it's always the first place to troubleshoot, genny issues. Good luck keep posted lots of info here!
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Old 02-23-2013, 01:11 PM   #5
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Since the Onan 7500 is widely used in all brands of diesel motorhomes, you might get more input if it was moved to the Motorhome General forum. I sent you a "suggestion" message that will allow you to move it if you wish.

Your Onan manual will explain the error codes, but a 31 is "Overspeed" and can be a problem with the speed governor. If you can get the top and front covers off (front is usually the side in most motorhome installations), you can get at the mechanism to see if it is sticking, or can replace it if necessary.

But a new fuel filter is always a good place to start, and much easier than burrowing inside!
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Old 02-23-2013, 02:42 PM   #6
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any how to-s to access fuel filter and its location

Aloha all,

Many mahalos for the suggestions and the prompt response!!! I would love to replace the filter! Does anyone have a quick how-to or pics and its location?

mahalo,

Jack
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Old 02-23-2013, 03:20 PM   #7
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Fuel & oil filters are behind/under a "trap door" on the bottom of the genny. You'll notice two plastic fixtures with "finger holes" - squeeze them together and door will open.....
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Old 02-23-2013, 08:58 PM   #8
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Your owner manual should show the filter location, but it is as H Miller describes.
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Old 02-24-2013, 08:30 AM   #9
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Last night installed the new fuel filter, it is one of the easiest projects thus far! Literally above the trap door!

Fired up the genny and waited, though it will run it immediately shuts off once any load is introduced!

1) it does sound different
2) it will run 4 amps but once more load is introduced it stalls out

Any other ideas???????

Does any one think cleaning the spark arrestor will help?????

Mahalo

Jack
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Old 02-24-2013, 08:57 AM   #10
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It sounds to me as though the speed governor is either stuck or defective.
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Old 02-24-2013, 11:04 AM   #11
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I had Onan in Medford check out my 7500 Friday because it would run/stop intermittently. The code was 33 which indicates temperature problems. The Onan technician determined the 7500 functioned correctly and thought one of the two inside start/stop switches was faulty. He checked those and they are good so he determines there is a wiring problem and suggested I take it to a Winnebago dealer. One thing he did was disconnect the remote start wiring and ran the generator from the generator switch panel. The generator ran fine when the remote start stop disconnected. So as a thought you might try disconnecting those wires and see if/how it functions that way.
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Old 12-17-2014, 11:47 PM   #12
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I have similar issues. Genny will start and die once load is introduced. Going to try the fuel filter, since I need to service it anyway. It does sound different when running........

662 day old thread bump, I know
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