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Old 07-05-2022, 08:29 AM   #1
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ONAN 5500 Running Issue

Running down the road the other day and fired up the onan 5500 gas generator. Started fine and ran for approximatly 20 minutes then cut off. No Problem

Today at RV Park TUrned off pedistal
Started right up and ran for 20 minutes and died
....Oil Check good ... plenty of fuel.
After around 30 minutes i was able to restart

Any sugesstions as to the cause and remedy?
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Old 07-05-2022, 08:49 AM   #2
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IF fuel levels are within the drinking straw range and you have eliminated that, then perhaps it is a heat related issue, as in the generator getting too hot to keep running, so it shuts itself down?


I had a fuel level in the main tank issue in one of my RVs and finally figured out that the generator did not run past 3/4 full RV tank! Went to Camping World they just pushed the straw down farther into the tank and all was well to the 50 percent fuel in the tank level. Once out in Canyon lands (105 plus temps) the generator kept cutting out and that was heat related as per the neighbor who suggested I run it with the compartment door open next time, and well it worked!
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Old 07-05-2022, 08:49 AM   #3
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There is another discussion which mentions this in the "MH General Discussions" room you might want to check out.
https://www.irv2.com/forums/f84/5500...mp-586121.html
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Old 07-05-2022, 08:51 AM   #4
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Quote:
Originally Posted by ucaatexas View Post
Running down the road the other day and fired up the onan 5500 gas generator. Started fine and ran for approximatly 20 minutes then cut off. No Problem

Today at RV Park TUrned off pedistal
Started right up and ran for 20 minutes and died
....Oil Check good ... plenty of fuel.
After around 30 minutes i was able to restart

Any sugesstions as to the cause and remedy?
Did the generator give any codes? If so, what was the code?

Look here for your manual:
https://www.cummins.com/rv-generator-manuals
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Old 07-05-2022, 03:39 PM   #5
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The next time it shuts down, go outside and pull the generator cover off. There is a light on the switch. It will blink out a code if the generator detected a fault.

From the Onan service manual:

"FAULT CODES
The genset controller provides extensive diagnostics by causing the status indicator light on the Control Switch to blink in coded fashion. Following a fault shutdown, the indicator light will repeatedly blink 2, 3 or 4 blinks at a time.

• Two blinks indicates a low oil pressure fault.

• Three blinks indicates a service fault. Press Stop once to cause the two-digit, second-level fault code to blink. (Pressing Stop again will stop the blinking.)

The two-digit code consists of 1, 2, 3, 4 or 5 blinks, a brief pause, and then 1 to 9 blinks. The first set of blinks represents the tens digit and the second set of blinks the units digit of the fault code number.

For example, Fault Code No. 36 appears as:

blink-blink-blink — pause — blink-blink-blink-blink-blink-blink — long pause — repeat

• Four blinks indicates that cranking exceeded 30 seconds without the engine starting.

• Note: Fault Code Nos. 3 and 4 are first level faults. Avoid interpreting them as second-level

Fault Code Nos. 33 and 44, which have purposely not been assigned as fault codes.

• Fault Code 36 means "I shut down but I have no idea why!". That means none of the monitored conditions, such as low oil pressure, caused the shutdown. It can be just fuel starvation.

Restoring Fault Code Blinking – The fault code stops blinking after five minutes (15 minutes, Series HGJAA & HGJAD). Press Stop three times within five seconds to restore blinking. Note that the last fault logged will blink even after the condition that caused the shutdown has been corrected."

Hmmm, that last sentence says a fault code may still be blinking, doesn't it?

https://thecampingadvisor.com/onan-g...r-fault-codes/

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
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Old 07-05-2022, 04:22 PM   #6
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