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03-16-2025, 07:44 AM
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#1
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Member
Tiffin Owners Club Appalachian Campers
Join Date: Jul 2024
Location: Vernon, Al
Posts: 72
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Onan Genset question
I have 126 hours on my generator and it started blinking 3 blinks then pause, the label on generator says service required, I just had the oil changed last year and only 12 hours since and was going to change again as soon as weather got better. Any clues?
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03-16-2025, 08:46 AM
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#2
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Senior Member
Tiffin Owners Club
Join Date: Mar 2010
Location: The Mogollon Rim
Posts: 197
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This is just generalized info Onan. Don't know what genset you have.
https://thecampingadvisor.com/onan-g...r-fault-codes/
__________________
2016 34PA
If you aren't fixing something daily...you're falling behind.
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03-16-2025, 08:53 AM
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#3
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Senior Member
Join Date: Mar 2024
Location: Bohemia NY
Posts: 3,267
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Why do folks think an oil change is relevant to any failure or that the oil change will prevent all failures? Start with is the battery good? Did you test with a meter? What is the battery voltage while holding the switch to start the generator.
__________________
Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle 
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03-16-2025, 11:26 AM
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#4
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Apr 2012
Location: Southern NM
Posts: 3,911
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Three blinks indicates a service fault. You’ll need to check your Onan manual to get instructions on retrieving the actual fault.
__________________
2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD
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03-16-2025, 11:37 PM
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#5
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Member
Tiffin Owners Club Appalachian Campers
Join Date: Jul 2024
Location: Vernon, Al
Posts: 72
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Kidding right
Quote:
Originally Posted by d23haynes57
Why do folks think an oil change is relevant to any failure or that the oil change will prevent all failures? Start with is the battery good? Did you test with a meter? What is the battery voltage while holding the switch to start the generator.
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I don’t think changing the oil is a answer to all questions, my statement was I just had the oil changed and If it was a second service code(if they Have them) then no problem with oils and Tiffin should have reset any timely codes if they exist.(MOD EDIT) I did all that checked it all, checked everything, thats why I posted because I found nothing wrong indicated.
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03-17-2025, 04:27 AM
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#6
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2014
Location: Somewhere On the Road
Posts: 1,327
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A group of us experienced the same with our 10Ks - checked for the simple stuff like sufficient voltage, ground, clean fuel / air filter with no luck. Then we changed out the 3 OEM start / stop / run relays with much better quality ones (Bosch bought from Amazon by the dozen) and problem-solved. Anecdotally we all believe the gens also start and run smoother.
__________________
Steve
2015 Itasca Ellipse QD | 2014 Jeep Grand Cherokee
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03-17-2025, 09:31 AM
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#7
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Member
Tiffin Owners Club Georgie Boy Owners Club
Join Date: Nov 2016
Location: Cherokee, NC (summer), Titusville, FL (winter)
Posts: 38
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Quote:
Originally Posted by Lv2Roam2
A group of us experienced the same with our 10Ks - checked for the simple stuff like sufficient voltage, ground, clean fuel / air filter with no luck. Then we changed out the 3 OEM start / stop / run relays with much better quality ones (Bosch bought from Amazon by the dozen) and problem-solved. Anecdotally we all believe the gens also start and run smoother.
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Thanks for the tips. Can you post a link to the relays on Amazon ?
__________________
Alan & Bev Miller, Smoky Mountains of North Carolina
2022 Tiffin Allegro Open Road 34PA"DRAKKEN"
2024 Ford Maverick Lariat Hybrid "DRAGON FIRE"
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03-17-2025, 10:17 AM
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#8
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Member
Join Date: Feb 2025
Posts: 40
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Sorry if I missed it stated but on both Onans I had you needed to push the shutoff or prime button to get past the first code (3 blinks) and to the second which should give some better indication of the issue.
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03-18-2025, 10:39 PM
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#9
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Member
Tiffin Owners Club Appalachian Campers
Join Date: Jul 2024
Location: Vernon, Al
Posts: 72
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1oK Cummins Onan, in a 21 Phaeton.
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03-18-2025, 10:40 PM
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#10
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Member
Tiffin Owners Club Appalachian Campers
Join Date: Jul 2024
Location: Vernon, Al
Posts: 72
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The manual just says see tech
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03-18-2025, 10:44 PM
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#11
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Member
Tiffin Owners Club Appalachian Campers
Join Date: Jul 2024
Location: Vernon, Al
Posts: 72
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Thanks Yea I checked it all I am a E engineer and Master electrician, and work on all my cars and trucks for fun and nothing stood out. I will change those relays,
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03-18-2025, 10:44 PM
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#12
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Member
Tiffin Owners Club Appalachian Campers
Join Date: Jul 2024
Location: Vernon, Al
Posts: 72
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Quote:
Originally Posted by Lv2Roam2
A group of us experienced the same with our 10Ks - checked for the simple stuff like sufficient voltage, ground, clean fuel / air filter with no luck. Then we changed out the 3 OEM start / stop / run relays with much better quality ones (Bosch bought from Amazon by the dozen) and problem-solved. Anecdotally we all believe the gens also start and run smoother.
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You know than you for a solid since-able reply
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03-19-2025, 10:39 AM
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#13
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2014
Location: Somewhere On the Road
Posts: 1,327
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Re: link request for relays - didn't find the exact ones we bought - pics below show same type - note 5 spade connectors...
__________________
Steve
2015 Itasca Ellipse QD | 2014 Jeep Grand Cherokee
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03-19-2025, 01:49 PM
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#14
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Senior Member
Join Date: Dec 2009
Location: North Texas
Posts: 1,123
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Quote:
Originally Posted by Bama E GOAT
I have 126 hours on my generator and it started blinking 3 blinks then pause, the label on generator says service required, I just had the oil changed last year and only 12 hours since and was going to change again as soon as weather got better. Any clues?
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Generator model size and age might help, but on most modern Onan Generators, 3 blinks indicates there is another service or fault code.
To find the fault code, briefly press the stop button 1 time and the blinking pattern will change to a series of 2 blinking sets. For example: Light blinking 3 times. Press stop button, blink changes to blink-blink pause blink-blink-blink = 23 or Service Fault 23 which is "Low Oil Pressure Cutoff Switch Fault".
That is just an example and you need to look up the faults codes for your specific generator.
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