Onan5500 won't run

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

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 !!

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.

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

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

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

First blush is bad oil pressure switch.