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Onan 7500 HDKAJ stops, shows 3-11 code


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  #1  
Old 11-07-2013, 05:37:21 PM
Pusherpilot Pusherpilot is offline
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Default Onan 7500 HDKAJ stops, shows 3-11 code

Hi all,

This is a problem that has plagued me with this generator since we bought the RV! While it was still in warranty Onan changed the "board" for this problem and it worked for a few years OK. This is a ten year old unit with only a few hundred hours on it. Last year I had a good dialog here when I couldn't get it to start out at Quartzsite after sub freezing nites. I finally determined that it was the temp sender and replacing it fixed that problem. I've had a health issue that has kept the RV parked for about 7 mos without running anything but now we're ready to go and sorting out all the problems that letting it sit brought on.
Now it's cranking after the proper delay for the glow plugs to heat up but only runs for a few seconds before it stops an shows a 3-11. That's a overcurrent fault, the same code it's shown since the beginning. I never got it to run long enough to pick up the load so there was no out put from it to the coach transfer switch. The manual advises me to turn the circuit breaker on the unit off and try again. The result is the same with the unit running from 2-3 seconds to around 30 sec before faulting again.
Anybody seen this before? Any ideas?
Ron
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  #2  
Old 11-07-2013, 08:08:21 PM
Gunny Gunny is offline
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Post the COMPLETE Model/Spec/Serial number.
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  #3  
Old 11-08-2013, 12:49:14 PM
Pusherpilot Pusherpilot is offline
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Complete Model spec and s/n are:
HDKAJ11451H

Spec H

s/n H030531865
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  #4  
Old 11-08-2013, 01:14:39 PM
Kpack
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

We'll look for a service manual in a little while.
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  #5  
Old 11-08-2013, 02:26:35 PM
Kpack
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Didn't know if you had the service manual. 981-0522B 7-99
http://www.cumminsonan.com/www/pdf/m.../981-0522B.pdf
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Old 11-08-2013, 04:12:53 PM
Pusherpilot Pusherpilot is offline
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Using the troubleshooting guide on page 18-9 the fix for this is to replace the controller.
Does anyone have experience with this code, 3-11, not being the result of a controller failure?
If all else fails and I need a new controller, are there options as to a source?
Thanks for the rapid response with the manual.
Ron
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Old 11-08-2013, 05:31:03 PM
Pusherpilot Pusherpilot is offline
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

No p/n's in the shop manual? Anyone have a p/n for the controller?
Thanks!!
Ron
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Old 11-08-2013, 06:13:33 PM
Kpack
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Here's the parts manual.
https://www.dropbox.com/s/hnpaymnt3h...201211hdkp.pdf
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Old 11-08-2013, 08:09:50 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Quote:
Originally Posted by Pusherpilot View Post
If all else fails and I need a new controller, are there options as to a source?
Ron
Check with Flight Systems. They may be able to repair the board you have (if it is not potted) for much less than a replacement. I have had them repair several & bought several boards. I have not ever heard anyone here at The Stack that was not completely satisfied with them.
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Old 11-10-2013, 09:11:04 AM
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J. McNugget J. McNugget is offline
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Default Re: Onan 7500 HDKAJ stops, shows 3-11 code

Flight systems repaired the control board of the larger brother of this set (HDKAG) about 3 years ago. It has probably logged 3,000 hours since then without issue. They are very competent, and quick too.

John
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