How to fix onan 4000 that will not stay running

https://www.rvandplaya.com/how-to-fix-fault-code-14-on-onan-generator/

This might help you.

It sounds very much like no AC output from the stator to the run circuit, or the main PCB failure

this may sound like a smart *** answer but turn on its side and shake it the low oil switch is stuck

check the oil pressure switch, if it does not register it will also give a code and will not start.

It's getting hot and shutting down

check oil sensor and oil level check tank for sediment and lines and crb for sediment also coil maybe going bad!!! :)

First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

does it have original oil in it? if so they use a lighter weight oil than recommended for engine break in. change your oil and filter and see if that doesnt solve it.could be thinning out loosing pressure when hot. i have seen this beofore.. :)

Hi, The 4000 rv unit unit is equipped with full diagnostics, and is indicated by the status light blinking. The blinking sequence, blinks a code as to the fault. If your unit runs and the status light is on without blinking, it is either the circuit breaker on the genset or in your distribution panel that needs to be reset. Good Luck, this should Fixya!

Try to restart to see what happens. However, make sure to have a volt meter to check output voltage. You may be loosing voltage and therefore it shuts down. Check oil pressure switch, rings, brushes. Replace brushes if they are less than 1/2" short and clean rings with emory cloth until copper is noticable.