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Old 07-10-2019, 10:09 AM   #1
parmalaserwash
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Default Onan 7500 33 code error

2003 Discovery with 7500 Non slide for generator
I have an onan 7500 worked fine had carpet guy there to clean carpets and generator stopped working. When I restarted the gen as soon as it takes a load it dies. Even when it switches over to charge the batteries thru the inverter it dies. I can turn the breaker off at the unit and it will run for hours no problem. Took to repair shop and error code reads 33.
They said:
1 Governor actuator is binding
2 Readjust high idle speed
3Replace control assembly.

They said we dont know what one is bad have to do all 3.

Anyone else experience this.

Thank you
Joe
SS/DA
69 Camaro

Last edited by parmalaserwash; 07-10-2019 at 11:25 AM.
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Old 07-10-2019, 07:44 PM   #2
1matcoman
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Default Re: Onan 7500 33 code error

Joe, most likely your control module has failed ($$$). Adjusting the high-idle is all but a waste of time, but, just to be sure it wouldn't hurt to try it. Hate to be the bearer of bad news, but it is what it is, bud.
Just to be sure, are you thinking that cleaning the carpets had anything to do with your issue?

Last edited by 1matcoman; 07-10-2019 at 07:49 PM.
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Old 07-10-2019, 09:59 PM   #3
parmalaserwash
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Default Re: Onan 7500 33 code error

Quote:
Originally Posted by 1matcoman View Post
Joe, most likely your control module has failed ($$$). Adjusting the high-idle is all but a waste of time, but, just to be sure it wouldn't hurt to try it. Hate to be the bearer of bad news, but it is what it is, bud.
Just to be sure, are you thinking that cleaning the carpets had anything to do with your issue?

Thanks for the reply, when I took it in for service, tech called the next day and said the block heater had short in it. I said where is that he said on the bed frame. So all i was thinking was the guy cleaning the carpets bumped it and caused the gen to quit. I said OK makes sense now. But that wasn't the case according to the tech he changed his mind after more investigation. Thanks again for the reply.
Joe
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Old 07-12-2019, 06:45 PM   #4
Rich Biebel
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Default Re: Onan 7500 33 code error

I sent you a reply to your email

The generator needs to be load tested independent from the Coach.

I use a 10kw resistive load bank to test all machines.

I would disconnect the wires from your Coach to the Onan and connect my load bank and test the generator right up to its full rated output....

That's about 62 amps from memory....

This will verify if the issue is the generator or something in your coach and trust me it is possible your inverter or something else like an AC unit is the problem and not the generator...

I have worked on and repaired many 7.5's and have not found the binding governor issue that Onan mentions in a service bulletin...

The control is not a separate part. It is part of the generators inverter section and is only replaceable as a complete new unit. Very costly to replace......so the load test is a must BEFORE the unit is pulled out of the coach......

I've seen this problem before and it was NOT the generator.....

The control unit section is all PC boards and the inverter section is the same....PC boards and high voltage components....all one sealed unit......

I've had 7.5's do some really unusual things......Start cranking the engine on its own with no switch signal to start. Had another one that would full field the generator end while trying to crank the engine. The starter would burn up trying to crank the engine.

I just did one where the unit started cranking and smoked the starter.....Pulled it out and replaced the control/inverter section along with the starter and other parts.......

Don't be confused when I say inverter. Your generator IS an inverter type machine and I'm not talking about the inverter in your coach.......2 totally separate things....
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Last edited by Rich Biebel; 07-12-2019 at 06:54 PM.
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Old 07-15-2019, 08:34 AM   #5
parmalaserwash
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Default Re: Onan 7500 33 code error

Quote:
Originally Posted by Rich Biebel View Post
I sent you a reply to your email

The generator needs to be load tested independent from the Coach.

I use a 10kw resistive load bank to test all machines.

I would disconnect the wires from your Coach to the Onan and connect my load bank and test the generator right up to its full rated output....

That's about 62 amps from memory....

This will verify if the issue is the generator or something in your coach and trust me it is possible your inverter or something else like an AC unit is the problem and not the generator...

I have worked on and repaired many 7.5's and have not found the binding governor issue that Onan mentions in a service bulletin...

The control is not a separate part. It is part of the generators inverter section and is only replaceable as a complete new unit. Very costly to replace......so the load test is a must BEFORE the unit is pulled out of the coach......

I've seen this problem before and it was NOT the generator.....

The control unit section is all PC boards and the inverter section is the same....PC boards and high voltage components....all one sealed unit......

I've had 7.5's do some really unusual things......Start cranking the engine on its own with no switch signal to start. Had another one that would full field the generator end while trying to crank the engine. The starter would burn up trying to crank the engine.

I just did one where the unit started cranking and smoked the starter.....Pulled it out and replaced the control/inverter section along with the starter and other parts.......

Don't be confused when I say inverter. Your generator IS an inverter type machine and I'm not talking about the inverter in your coach.......2 totally separate things....

Thanks Rich
We put a new inverter in this year, just so you know last one wouldn't power any outlets. I will try to find someone that can do what you suggested.
Thanks again
Joe
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