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Code 14 on LPG ONAN 5500 - stops on disconnecting load

dennysbabe
Explorer
Explorer
We have a propane ONAN Marquis Gold 5500 generator in our 5th wheel purchased new in 2008. It has 775 hrs on it and my husband has kept it serviced. No past problems with it except for a previous Fault Code 14 that was fixed by adding oil.

Recently it's been in the shop for other reasons for about 2 months and after bringing it home my husband started it up to let it run for maintenance purposes and it shut off by itself after about 30 minutes and showed Fault Code 14. Both propane tanks are full. He added very little oil thinking it might be that and it restarted without any problem. However, it shut off again after about 30 minutes with the same fault code. Each time it was run without a load. Today he ran it with a load (fireplace and tv) and it ran fine without shutting down for an hour. However, once he turned off the fireplace then the tv, the generator shut off by itself again. This time it gave no fault code (no blinking lights at all). It always starts right up and runs very smooth without any surging. He restarted and tried it again. This time he ran it 45 minutes without any problem then turned off the tv then the fireplace and it shut down again and once again without a fault code.

We are perplexed as to what might be wrong Any ideas or suggestions other than taking it to the shop?

Thanks,
Phyllis
9 REPLIES 9

skullokz
Explorer
Explorer

why don't you call an expert?

While I am sure the OP would find your comment extremely helpful, you are responding to a post that's 11 years old. 

 


Jeff - 2023 FR Sunseeker 2400B MBS

gotsmart
Explorer
Explorer
ronfisherman wrote:
I did a quick Google search. Fault code 14 is a over frequency fault. This is caused by your generator running at a higher frequency than 60 Hz.
I have a Kill A Watt meter that I plug into a 120 volt receptacle. One of it's readings is frequency. You will probably see a higher than 60 Hz reading when generator has no load on it. Usually requires adjustment of the governor speed to get proper Hz.

I bought a TRC Digital Monitor AECM20020 for this very reason. Nice description here. It's $60 price is a lot when compared to the Kill A Watt meter's price, but I bought for the fact that it measures frequency. In my case the surge protector is on the pedestal. It is fine for over/under volt on the shore power, but I have no monitor for the MQ4000 when boondocking. This monitor, with its alarm, was my solution to cover both. features:

  • Voltage range 85 to 150 Vac RMS
  • Frequency range 40/80 Hz
  • Operating current 0.02 Amp
  • Under voltage alarm less than 102 Vac RMS
  • Over voltage alarm greater than 135 Vac RMS
  • Under frequency alarm less than 55 Hz
  • Over frequency alarm greater than 65 Hz
  • Outlet type 120V/15A single phase
  • Operating temperature range +32?F to +125?F
  • Backlit LCD display
2005 Cruise America 28R (Four Winds 28R) on a 2004 Ford E450 SD 6.8L V10 4R100
2009 smart fortwo Passion with Roadmaster "Falcon 2" towbar & tail light kit - pictures

j-d
Explorer II
Explorer II
A brain that's Too Old reading Too Many Genny Threads!

Thank Heaven it's an ONAN! Even if ONAN didn't work better, which I believe it does, the sheer availability of parts and information makes them better to own.

Sounding more and more like it's not getting back to its No Load/Idle State, RPM-wise, causing the Logic Board to shut it down.

With apology for thinking it was that Dark Side Brand, I line up with the Check Linkage Gang.

If this gets any deeper, be sure to post the ONAN Model and Spec codes.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB

jauguston
Explorer
Explorer
jd,

A non-inverter generator like that one runs at a constant speed with slight variation depending load.
2005 Coachman Sportscoach Elite 402 40'
350hp Cat C-7 w/MP-8
7500w Onan quiet diesel generator
6-Kyocera 130w solar panels SB3024i MPPT controller
Pressure Pro TPMS
1987 Suzuki Samurai tintop Toad w/VW 1.6 turbo diesel power

Heish
Explorer
Explorer
J-D he said it was an Onan Marquis Gold 5500.

jauguston
Explorer
Explorer
Good advice on overcycling. The cycles are controlled by engine rpm. A Kill-A-Watt meter is a good investment and will tell you what the cycles are. With no load they should be about 62 cycles and at full load should drop to about 58 cycles. If they are out of spec try lubing all the throttle/governor linkage. If that doesn't fix it the governor may need to be adjusted. That is done on the linkage.
2005 Coachman Sportscoach Elite 402 40'
350hp Cat C-7 w/MP-8
7500w Onan quiet diesel generator
6-Kyocera 130w solar panels SB3024i MPPT controller
Pressure Pro TPMS
1987 Suzuki Samurai tintop Toad w/VW 1.6 turbo diesel power

j-d
Explorer II
Explorer II
Suggest you click "Notify Moderator" and ask to move this to Tech Issues. Not 'cause it's a Fiver and this is Class C, but because a genny can be in anything and Tech is where some of our Genny Gurus hang out.
Generac isn't as popular as Onan, so might take awhile to hear from somebody. Be sure to post the full Model Number. If there's a Manufacture Date, suggest you include that.
Finally, there's Smokstak.com which includes gennys and within that includes Generac.
Remember, even though most RV gennys run at a certain RPM, they still "idle" at that RPM if there's no load. At least in gasoline gennys, there's an "idle circuit" in the carburetor and its passages are even smaller than those in the power circuit. This means it's possible for a genny to carry a load yet not be able to run no-load. I had that exact situation with our Onan 4KW 3600RPM gas genny. Sometimes the carb can be cleaned and adjusted. I had to replace ours.
EDIT: I like ronf's comment above. With older gennys, those without solid state logic control boards and electronic voltage regulation, Cycles (hZ) and Voltage were "wound" into the build of the genny. If it produced 60hZ and/or 120VAC (whichever you had a meter that could display it) then it WAS at 1800 or 3600RPM. Likewise if you had a tachometer, if you could verify it was at 1800 or 3600RPM, you didn't need any other test equipment to know it was at 60hZ/120VAC. But you have some form of electronics capable of displaying that "14" so you may need more tools, more help.
Easiest thing to do might be make sure all the mechanical linkages are completely clean and free. If it can't get back to idle, it's likely to trigger that code and shut down.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB

ronfisherman
Moderator
Moderator
I did a quick Google search. Fault code 14 is a over frequency fault. This is caused by your generator running at a higher frequency than 60 Hz.
I have a Kill A Watt meter that I plug into a 120 volt receptacle. One of it's readings is frequency. You will probably see a higher than 60 Hz reading when generator has no load on it. Usually requires adjustment of the governor speed to get proper Hz.
2004 Gulf Stream Endura 6340 D/A SOLD
2012 Chevy Captiva Toad SOLD