We hit a heat wave and had to run our generator an Onan (HGJAB901A), it quit and threw a Code I believed was "Low Oil Pressure", I assumed it was due to low oil level and refilled. Now it just starts, runs for 10 or 20 seconds and dies and throws a code 3. I didn't have the manual with me yesterday when I refilled the crankcase and tried to start so I forgot how to check for the second level code.I'll go back maybe tomorrow but is there a reset or does the low pressure limit switch automatically reset if it shut off due to low level?Yes I have searched to forums but to no avail, if anyone searches and finds a similar post, please include the search wording used.

Welcome to the club having RV generator problem ;)On my Generac oil pressure switch is open under pressure and those switches are known to malfunction. But disconnecting the wire will keep the generator running.

Is yours one of the models that code 3 just means you have to check for the code.

All I know is that mine did that once and cleaning the air filter took care of it.

darsben1 wrote:Is yours one of the models that code 3 just means you have to check for the code.Yes it is and if I remember correctly, I checked and it was a Code 23/low oil pressure. I didn't have my user manual with me yesterday, but I think it did show a Code 23 yesterday. This failure occoured awhile ago and every time I'm at the storage yard i forget to take tools and the manual.I was just hopeing that someone wouls say thereis a magic reset chant I could make to cancel the fault. In fact I still do.

D.E.Bishop wrote:I was just hopeing that someone wouls say thereis a magic reset chant I could make to cancel the fault. In fact I still do.If you are old enough you remember old joke (involving Bill Gates) about resetting the car who die on the freeway by closing the doors and cycling the ignition. In reality this thing is happening, but when software glitch will fix itself this way, faulty sensor will not. I spend $600 lately on on couple of sensors for my car plus $150 to reset the code at dealer. You don't have my pity ;)

Onan starts and dies, throws Code 3 | Good Sam Community

D_E_Bishop
Explorer
Oct 02, 2017
UPDATE I reread the codes, Flashes Fault Code 3, press STOP, Flashes Fault Code 23, Oil Pressure Fault Switch.

I followed the trouble shooting instructions and no problems detected. I also changed the filter and oil and I disconnected the Low Pressure Fuel Pump hose and the pump is working well.

Right now I feel the problem is in the control panel which is behind the carb and air intake and which I believe will require removing the entire generator. It is a pretty simple job but if I did that, I would be at the end of my knowledge. I would assume that a Onan authorized repair shop would also just change the control module or PC board or what ever it is called.

I would have to build a cradle to rest on my floor jack that would support the four corners of the generator. Too big a job and I have no space to do the work. I would have to do it in the street in front of the house and the DW would not like that.
dcunningham
Explorer
Sep 25, 2024
Fault 3 is a general code that indicates you need to check for a secondary code. After it does the 3 flashes, hit the off button only once and a secondary code will pop up. I'm having that issue right now with only 40 hours on the generator.
Your crankcase should only be filled halfway between "ADD" and "FULL".
- way2roll
  Navigator II
  Sep 26, 2024
  Not sure if you are aware but you are responding to a post that's 7 years old. OP hasn't been on here in some time.
  - dcunningham
    Explorer
    Sep 26, 2024
    So maybe we should never respond to old posts?

Forum Discussion

Onan starts and dies, throws Code 3

About Technical Issues

Related Content

Onan starts and dies

Batteries died...sheesh

Throwing in the towel

Norcold 1200 throws GFCI when starting

Throw away trailers??