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Old 03-31-2021, 12:30 AM   #1
Jph
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Onan generator

After running my generator most of the day to power AC and frig the light on panel began flashing red. The generator was running but not putting out any power. I turned it off and the next day restarted it and it provided power all day. Does anyone know what caused this?
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James H.

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Old 03-31-2021, 12:39 AM   #2
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Could it have overheated?
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Old 03-31-2021, 12:47 AM   #3
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Are you thinking the ATS may have overheated? It may have but the weather is pretty temperate here right now.
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Old 03-31-2021, 03:51 AM   #4
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There is a breaker on the generator that can tripped. Check on the unit.
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Old 03-31-2021, 09:16 AM   #5
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Here is a link to the manuals. Maybe you will find your error code there.
https://www.cummins.com/rv-generator-manuals
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Old 03-31-2021, 08:56 PM   #6
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Generator

Thanks guys for the suggestions 👍
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Old 03-31-2021, 09:07 PM   #7
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Check the connections inside the ATS. A few folks have found loose wires which caused problems
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Old 04-01-2021, 12:17 PM   #8
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Next time it flashes red... count the number of Flashes and then use the handy decoder chart in the manual. I keep a copy of just that page handy in my info bag just for such an event (so I can find it quickly).
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Old 04-01-2021, 05:27 PM   #9
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the inside control panel light flashing red and generator still running?
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Old 04-01-2021, 07:21 PM   #10
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Following for info.
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Old 04-01-2021, 07:34 PM   #11
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make sure you change the oil after 25 hours and every 25 + hours ..easy to change
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Old 04-01-2021, 10:55 PM   #12
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Originally Posted by Scubawise View Post
make sure you change the oil after 25 hours and every 25 + hours ..easy to change


Onan recommends oil change at 20 hours and every 150 thereafter.
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Old 04-01-2021, 11:26 PM   #13
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On my Onan generator, it says to change the oil at 20 hours and then every 250 hours. That is also dependent on how and where it was used(weather conditions).

Paul
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Old 04-02-2021, 12:56 AM   #14
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Thanks all next change in 150 hours
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Old 04-02-2021, 03:24 AM   #15
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New engine change oil around first 50hours, then every 150 hours will be good enough, you can change oil more often that didn’t hurt anything. Only around $10 each time if you want DIY. Check the air filter while you change oil, plug should change every 200-250 hours from Onan.
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Old 04-02-2021, 01:39 PM   #16
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Thx did not see air filter onan 4000
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Old 04-02-2021, 04:22 PM   #17
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And youíre supposed to clean the spark arrestor every 50 hours. Itís easy.
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Old 04-07-2021, 07:03 PM   #18
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Not The Generator

I had this happen to me before. Generator ran just fine all day then suddenly no power but it still ran just fine. Shut it off and plugged into shore power and everything worked. Next day the generator started and ran normal but no power output or so I thought. Checked everything. Turned out to be an issue with the transfer switch. At initial build and install they failed to tighten the nuts on the wire to switch and after a thousand miles or so they shook lose and actually did some arching and tripped the switch to off inside the switch so the generator could deliver no power to it but shore power did. There was some significant burn marks inside the transfer switch box, we were lucky it didn't catch on fire and burn the RV up. I had a mobile repair guy come out to our campsite and replace the switch with a much higher quality one and Thor reimbursed me.
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Old 04-07-2021, 07:20 PM   #19
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And youíre supposed to clean the spark arrestor every 50 hours. Itís easy.
How you clean the spark arrestor , and where is it , there is a screw in tail pipe , can not get it loose
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Old 04-07-2021, 07:27 PM   #20
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Originally Posted by Mgtv53 View Post
How you clean the spark arrestor , and where is it , there is a screw in tail pipe , can not get it loose


Itís just a plug in the generator exhaust that you need to unscrew and then run it for a few minutes. I havenít done it for a while now but I think it takes a square drive ratchet. Itís easy though.
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