Onan Q4000 genset problem

Jim Wahl · 04-15-2014, 11:38 AM

OK so it was humming away with no problems on Friday at the race when it just shut off. Wouldn't restart. Let it cool off. Nothing. It will turn over and start and run until you take your finger off of the outside manual start button. Anybody got any ideas?

It is a 2011 Onan Q4000 with the flashing light trouble signal on the outside start button but the only code that gives is the "service" three blink code. ??? Jim

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Rich Biebel · 04-15-2014, 12:15 PM

Jim if you push the button to stop once when it is still flashing 3 times, you should see a second fault code. Probably a series of two seperate blinks. If you can tell me what that is, I can give you more info. How many hours are on the machine?

Jim Wahl · 04-15-2014, 06:35 PM

Quote:

Originally Posted by Rich Biebel

Jim if you push the button to stop once when it is still flashing 3 times, you should see a second fault code. Probably a series of two seperate blinks. If you can tell me what that is, I can give you more info. How many hours are on the machine?

Rich, the code it gives me is 32. that doesn't make sense according to my manual. That code is shown as a "low cranking speed fault", but it's not cranking slowly.
My unit has 839 hours on it. Jim

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Rich Biebel · 04-15-2014, 07:19 PM

Jim check your message inbox....

MacNicol Racing · 04-16-2014, 11:59 AM

Jim, I had a similar problem with mine years ago. I don't recall if it was the same code as you are getting though. Mine ended up being the circuit board. Replaced it and it started right up.

Jim Wahl · 04-17-2014, 09:26 PM

Thanks Mac. Rich, I answered you, did you get it? Jim

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Rich Biebel · 04-18-2014, 07:16 AM

I did Jim but emptied my messages and it must have not been sent to you.

Warrantee is 2 years on a 4KY in an RV
The Motorhome builder would refer you to Cummins-Onan for repairs

There is no quick fix and you need to take it to someone who is capable of diagnosing it and repairing it. A Cummins-Onan Authorized shop if it is under warrantee. Or someone with the knowledge and experience that is familiar with Onan's. The machine may have to be removed from the MH to be repaired.

Jim Wahl · 04-18-2014, 11:53 AM

Thank you Rich. Jim

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Bill Baer · 07-23-2014, 12:05 AM

"I.had a similar problem with mine years ago. I don't recall if it was the same code as you are getting though. Mine ended up being the circuit board. Replaced it and it started right up."
Same here but mine is older so no codes it just wouldn't run when you released the button I too replaced the circuit board and that fixed it.
(Please be seated before asking the price of the circuit board

. )

Jim Wahl · 10-01-2014, 10:58 PM

Took it to Cummins/Onan in Orlando. They found it to be a bad bearing on the winding shaft. They had to completely tear the unit apart. They were good to me and did it under warrantee. It would have been $1100. Got it back and first time out it quit after exactly one hour of work. Took it back and the fuel pump was bad. They replaced the pump and filter. $349. I haven't taken the RV out since then. Just bought an extended warrantee from Good Sams. It will probably come in handy. Jim

.Bill, I found a circuit board on ebay for $325 from a dealer out West. Didn't need it and they took it back!

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04-15-2014, 11:38 AM	#1
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,841 Likes: 626 Liked 672 Times in 121 Posts	Onan Q4000 genset problem OK so it was humming away with no problems on Friday at the race when it just shut off. Wouldn't restart. Let it cool off. Nothing. It will turn over and start and run until you take your finger off of the outside manual start button. Anybody got any ideas? It is a 2011 Onan Q4000 with the flashing light trouble signal on the outside start button but the only code that gives is the "service" three blink code. ??? Jim . __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. SSSSA Forum Moderator

04-15-2014, 12:15 PM	#2
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: Onan Q4000 genset problem Jim if you push the button to stop once when it is still flashing 3 times, you should see a second fault code. Probably a series of two seperate blinks. If you can tell me what that is, I can give you more info. How many hours are on the machine? __________________ Rich Biebel S/C 1479

04-15-2014, 07:19 PM	#4
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: Onan Q4000 genset problem Jim check your message inbox.... __________________ Rich Biebel S/C 1479

04-16-2014, 11:59 AM	#5
MacNicol Racing Junior Member Join Date: Nov 2007 Location: North Port, Fl Posts: 58 Likes: 49 Liked 11 Times in 6 Posts	Re: Onan Q4000 genset problem Jim, I had a similar problem with mine years ago. I don't recall if it was the same code as you are getting though. Mine ended up being the circuit board. Replaced it and it started right up. __________________ Kevin MacNicol 2120 STK & S/ST

04-17-2014, 09:26 PM	#6
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,841 Likes: 626 Liked 672 Times in 121 Posts	Re: Onan Q4000 genset problem Thanks Mac. Rich, I answered you, did you get it? Jim . __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. SSSSA Forum Moderator

04-18-2014, 07:16 AM	#7
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: Onan Q4000 genset problem I did Jim but emptied my messages and it must have not been sent to you. Warrantee is 2 years on a 4KY in an RV The Motorhome builder would refer you to Cummins-Onan for repairs There is no quick fix and you need to take it to someone who is capable of diagnosing it and repairing it. A Cummins-Onan Authorized shop if it is under warrantee. Or someone with the knowledge and experience that is familiar with Onan's. The machine may have to be removed from the MH to be repaired. __________________ Rich Biebel S/C 1479

04-18-2014, 11:53 AM	#8
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,841 Likes: 626 Liked 672 Times in 121 Posts	Re: Onan Q4000 genset problem Thank you Rich. Jim . __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. SSSSA Forum Moderator

07-23-2014, 12:05 AM	#9
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Onan Q4000 genset problem "I.had a similar problem with mine years ago. I don't recall if it was the same code as you are getting though. Mine ended up being the circuit board. Replaced it and it started right up." Same here but mine is older so no codes it just wouldn't run when you released the button I too replaced the circuit board and that fixed it. (Please be seated before asking the price of the circuit board . ) __________________ Bill Baer 3391 SC, 339B SC, QR

10-01-2014, 10:58 PM	#10
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,841 Likes: 626 Liked 672 Times in 121 Posts	Re: Onan Q4000 genset problem Took it to Cummins/Onan in Orlando. They found it to be a bad bearing on the winding shaft. They had to completely tear the unit apart. They were good to me and did it under warrantee. It would have been $1100. Got it back and first time out it quit after exactly one hour of work. Took it back and the fuel pump was bad. They replaced the pump and filter. $349. I haven't taken the RV out since then. Just bought an extended warrantee from Good Sams. It will probably come in handy. Jim .Bill, I found a circuit board on ebay for $325 from a dealer out West. Didn't need it and they took it back! . __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. SSSSA Forum Moderator Last edited by Jim Wahl; 10-01-2014 at 11:00 PM.