Onan5500 won't run

[bukweet53]

After having intermittent shutdowns and code 2. After changing oil it will only run if I pull wire off oil pressure switch. On a recent trip it shutdown a few times throwing code 2 even after adding oil. Shutdowns at different times and days.

[Hurricaner]

When you change the oil, prefill the oil filter before you screw it on.
Sam

[bukweet53]

So took wire off switch and it cranked up. Ran it for two hours no problem. Let it cool down and checked oil, it was a little below the full mark. Hooked wire up an it fired up and ran just fine. Maybe just a bubble and needed a good fart... running fine now.Thanks everyone !!

[Grit_dog]

jdc1 wrote:

Grit dog wrote:
First blush is bad oil pressure switch.

Agreed. It's $10 part. Worth trying before paying someone to look at it.

Or low oil pressure, which would be easily diagnosed by throwing the (cheap) part at it first.

[A1B00902]

Onan Generator Blink Code 101
Onan Generator Fault Code List
Code 2 - Low Oil Pressure
Code 3 - Service Check
Code 4 - Over Crank
Code 12 - Over Voltage
Code 13 - Under Voltage
Code 14 - Over Frequency
Code 15 - Under Frequency
Code 19 - Governor Actuator Overload
Code 23 - Low Oil Pressure Cutoff Switch
Code 27 - Voltage Sense Error
Code 29 - High Battery Voltage
Code 31 – Overspeed
Code 32 - Low Cranking Speed
Code 35 - Control Card Failure
Code 36 - Engine Stopped
Code 37 - Invalid Generator Set Configuration
Code 38 - Over Current (Field Overload)
Code 41 - Generator Rotor
Code 42 – Processor
Code 43- Processor Fault Code.
Code 45 - Speed Sense
Code 47 – Ignition
Code 48 - Generator Field Sense
Code 51 – Processor
Code 52 - Fuel Injector
Code 54 - MAT Sender
Code 56 - MAP Sender
Code 57 - Over Prime
Code 58 - Exhaust Gas Temperature Shutdown
Code 81 - Exhaust Gas Temperature Sensor Open
Code 82 - Exhaust Gas Temperature Shorted
Onan Generator Code Reset
Some Final Words

[jdc1]

Grit dog wrote:
First blush is bad oil pressure switch.

Agreed. It's $10 part. Worth trying before paying someone to look at it.

[Grit_dog]

First blush is bad oil pressure switch.