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02-01-2015, 09:19 PM
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#1
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Winnebago Owner
Join Date: Aug 2009
Location: Saddlebrooke, AZ
Posts: 213
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Onan Generator fail
Well...tried to start the generator up tonight since we are dry camping and my wife wanted to use the microwave to heat up dinner...
Pressed the start button, generator starts up but the light on the button flashes rapidly instead of going solid...I wait a minute but still flashes rapidly...and no AC. So I power down and do it again...same result.
I go outside and remove the cover. from the generator Breakers are ok and now I see a code flash on the start button....27 which when I look in the manual pretty much tells me I am screwed!!!
Code 27 Voltage Sense Loss
Controller unable to sense output voltage
See an authorized Onan dealer!!
The generator has about 12 hrs on it!!!
__________________
2009 WGO Tour 40TD
2012 Honda Fit Sport 5sp
Saddlebrooke, AZ
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02-01-2015, 10:01 PM
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#2
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Winnebago Camper
Join Date: Feb 2012
Location: Southern California
Posts: 42
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While this might sound dumb, why not check several items:
1. Winnebago's have a shutoff if your gas is down to 1/4 tank. Genny will not state.
2. Check battery connections
3. Check spark plug contacts
Just a few easy items to check.
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2006 Monaco Signature 45' Commander IV ISX 600 dance:
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02-01-2015, 10:12 PM
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#3
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Winnebago Camper
Join Date: Oct 2009
Location: Fort Pierce, FL
Posts: 13
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Why not google error 27?
__________________
[SIGPIC][/SIGPIC]Revolution LE 38X C9 Cat
2011 Scion TC toad
1985 KLR 600 as a backup...
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02-02-2015, 05:46 AM
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#4
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Winnebago Owner
Join Date: Aug 2009
Location: Saddlebrooke, AZ
Posts: 213
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Quote:
Originally Posted by krivanj
Why not google error 27?
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I did...bad voltage regulator or brushes or loose wire....hard to believe on a 6 month old MH but I have had a few issues...bad control board in the LP furnace to start off my trip as well
__________________
2009 WGO Tour 40TD
2012 Honda Fit Sport 5sp
Saddlebrooke, AZ
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02-02-2015, 05:59 AM
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#5
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Winnebago Master
Join Date: Apr 2003
Location: Skiatook, OK
Posts: 1,467
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MutinyGuy, Try starting the generator with the generator breakers open and see if you still get the flashing lights. If not then close the breakers and see what happens. On ours the sealtite slipped down where is comes out of the generator and shorted one of the power wire to ground. Onan tech replaced a bunch of parts without fixing it then I found the shorted wire.
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Grant & Pat
2014 Adventurer 35P
2021 Rapid Red 4dr Bronco OBX
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02-02-2015, 09:21 AM
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#6
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Winnebago Owner
Join Date: Aug 2009
Location: Saddlebrooke, AZ
Posts: 213
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Started up generator this AM same problem Code 27...flipped the two breakers off on generator and restarted. Ran ok no errors...flipped first breaker on...looking ok...flipped second breaker on...still running fine no codes...clunk I hear transfer switch engage...go inside...Power!!!
Ran microwave for breakfast, still ok. Powered off generator and waited a few minutes. Started generator from inside with breakers on and had power and no codes!
__________________
2009 WGO Tour 40TD
2012 Honda Fit Sport 5sp
Saddlebrooke, AZ
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02-02-2015, 09:24 AM
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#7
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Winnie-Wise
Join Date: Oct 2013
Location: Altoona, Iowa
Posts: 419
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Quote:
Originally Posted by MutinyGuy
Started up generator this AM same problem Code 27...flipped the two breakers off on generator and restarted. Ran ok no errors...flipped first breaker on...looking ok...flipped second breaker on...still running fine no codes...clunk I hear transfer switch engage...go inside...Power!!!
Ran microwave for breakfast, still ok. Powered off generator and waited a few minutes. Started generator from inside with breakers on and had power and no codes!
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GREAT!
__________________
2010 Itasca Sunova 33C (a lot of modifications)
2004 Jeep Rubicon, 34K miles (highly modified)
Three cats and the wife
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02-02-2015, 02:13 PM
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#8
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Winnebago Master
Join Date: Nov 2005
Posts: 1,080
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I tried to post a page from the Onan repair manual earlier, but I kept getting a formatting error. It seems the problem is lack of voltage across pins S1 and S2 after the starter has been disconnected from the engine.
Possible causes are listed as: Genset Load, inverter charger, VAC sense transformer, engine governor malfunction, fuel supply, choke, demand regulator, carburetor, generator windings, ignition, wire connections, or temperature.
In your case it sounds like the transfer switch didn't move to the generator position quickly enough. I've been told 2015 is the first year Winnebago is using a transfer switch on the Adventurer that has voltage sensing capability. If the explanation for the system operation is correct it's supposed to make sure the voltage is within the proper parameters before switching over. If it sees high or low voltage it will not switch.
The timing between that and the built in delay before the generator starts to produce power may have caused the error.
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Hikerdogs
2013 Adventurer 32H
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02-05-2015, 06:26 PM
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#9
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Winnebago Owner
Join Date: Jul 2010
Location: Snohomish WA
Posts: 65
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I've had a little issue with my ATS as well. In Nov. my original ATS stopped working. I would start the generator, the lights on the power panel would (after 20 seconds) light up then go dark. No power. Took it to the dealer and they confirmed that I nneded a new ATS, so I ordered one and took it to them to install. It was the new and improved Parallax ATS503, and it was DOA. The delay relay was bad. Got a new one from Parallax, dealer installed it, and this past week when I need it to work while dry camping it exhibited the same behavior. Back to the dealer this morning and low and behold they confirmed it was the ATS again.
BTW I did try the process that MutinyGuy used and it did not work for me.
__________________
2017 Winnebago Adventurer 35P, towing a 2018 Ford Edge Sport. Roadmaster RSSA, UltraPower, Blue Ox Rear track bar and CHF
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