We have a gas powered Onan generator , that random ly shuts off . It flashes a generic shut down code. The fuel pump has been replaced . I have a picture of the unit serial number of some one wants to post it for me . Any ideas would be appreciated .

How old?….if you have tried everything it will probably be the $700 control board….

It’s an 2003 I think . Thanks for the help.

what code are you getting the three flashes is not a code

Remind me again how to put it in diag mode.

Press the off button 3 times in 5seconds. It will blink 3times indicating diagnostics. Press button once and read code. To clear code press off button twice

if this unit is on a trailer mounted in a compartment they are real prone to overheat due to discarge and inlet close togather, i built dividers on one or two ive had

Ok. Thank you

[QUOTE]Originally posted by rusty:
if this unit is on a trailer mounted in a compartment they are real prone to overheat due to discarge and inlet close togather, i built dividers on one or two ive had[/QUOTE

It shuts off at random times, regardless of runtime. Also won’t restart all the time ? Acts like it’s not getting fuel?

Mine was a fuel pump when I was having those symptoms.

the code is the key unless it is the catch all code

My onan 5500 was doing the same thing. It ended up being the Gen set control board. I bought an aftermarket one from Flight Systems and have put about 300 hours on it without it cutting off.

My 2001 Onan 7k efi still giving me fits after having it out of the trailer and checked out by an Onan certified tech with 40 yrs experience. Worked for about 4 weekends, then began running slow and belching soot...new plugs didnt help.

About to order the board from Flight Systems, as well.

Rich has spoiled everyone giving answers on these problems so quickly in the past. Hopefully he will come along soon.

quote:

Originally posted by CURTIS REED:
Rich has spoiled everyone giving answers on these problems so quickly in the past. Hopefully he will come along soon.

My thoughts exactly. Rich / SCDIV1 has been our Gen Set guru on here for many years.

Our generator has a CO2 sensor and doesn't like to be inside a cabinet, so we made a "slide out" and no more problems.

I guess you could engineer a fan into the cabinet, but don't try and take air from inside the trailer, as it also lets out a lot of noise!

Drained the oil , as I heard the full line is mislabeled I’ve heard. Problem still present . Is there something to this specific type of am board?

This message has been edited. Last edited by: Mike Frizie, July 11, 2024 10:05 AM

really need the code.oil switch be issue.if it is one wire just unhook switch and try it

10-4. So oil pressure opens the circuit to ground. ( Hope I’m saying that right) . That’s what I needed to know . Thanks .

just read my post this is the edit oil switch MAY be the issue lol