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Old 05-06-2021, 02:24 PM   #1
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Brand: Thor Motor Coach
State: Florida
Posts: 116
THOR #17954
2015 an up Onan 4000KW models 4KYFA

I have found out through Onan and several certified service techs that on these models the oil level or oil sensor was eliminated. The provision on the control board is bypassed. Another interesting thing I found out from Flyght systems is their replacement control board has eliminated the code system. So mode flashing codes when this board is used. Another thing I learned was in order to get to brushes or clean stator the engine must be separated from the generator. Totally enclosed on newer generator s.
The service techs here in Tampa at Cummins Onan swear the newer generation 4000KW have several bugs. They are backed up for months on generator repairs.
Yes mine still not fixed. Havenít had a chance to bring home and pull out. Still only runs when you push and hold start button. Hopefully this weekend. Looks like my job to fix. Every shop booked for months. Plus original repair service wonít touch generators any more. Lazydays, Camping World and General RV here locally booked for months and not interested in the work. RV Medic will look at it once out and I bring it to them. Letís hope I can fix.
Stay safe

Just up dating all

Luke

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Old 05-07-2021, 12:06 AM   #2
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Brand: Thor Motor Coach
Model: 2016 Vegas 25.2
State: Florida
Posts: 2,379
THOR #1589
Good luck to you! Let us know what the fix is.
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Old 05-27-2021, 04:00 PM   #3
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Brand: Thor Motor Coach
State: Florida
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THOR #17954
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Originally Posted by Mr Sunshine View Post
Good luck to you! Let us know what the fix is.


So the Onan generator problem resolution. On all 4KYFA26 models grounding is critical. Your fuel solenoid must have a tight ground. Mine was loose and stripped. Next grounding lug on bottom of left front side of pan is prone to corrosion and vibrates loose. This is wear your main batteries negative lead connects. I redid ground and tightened. Now the fault. What happens as ground is not steady the voltage regulator in the control board fails due to erratic contact. Voltage dropping and starting again. Unfortunately the cheaper Flight System replacement board fails way sooner than the Onan board. The Onan board, much more expensive , will send out a code if voltage dropping. Flight Systemís board has no code provisions. Lesson learned. Onan fixed.
Last issue never fill oil to fill line , leave at least a quarter above first line. Your generator will never cut out running till you turn off.

Luke
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