Generator starts than shuts down on under voltage

If the Carrier Comfort Pro 6100 APU is not producing AC voltage, it will shut off as it is designed to do so to protect the system. This is because the APU needs to have a stable voltage output to run properly, and if there is no voltage, the system will shut down.
Regarding the circuit breakers, it's possible that they may be faulty and need to be replaced. You can test the breakers with a multimeter to determine if they are functioning properly. If they are not, you will need to replace them.
However, there could be other issues causing the lack of voltage from the generator. It's possible that the generator itself is faulty or that there is an issue with the voltage regulator. A professional technician with experience working on APUs would be best suited to diagnose and repair the issue.

Here are some common troubleshooting steps to help you identify and potentially resolve the problem:

1. Fuel Supply:
   • Check the LP (propane) fuel supply. Ensure that there is enough propane in the tank.
   • Check for any obstructions or kinks in the fuel line.
2. Air Intake and Exhaust:
   • Make sure the air intake and exhaust are not blocked. Lack of proper ventilation can cause the generator to shut down.
3. Choke Position:
   • Check the position of the choke. If it's set to "Choke" for starting, make sure to gradually move it to the "Run" position once the generator has started.
4. Fault Codes or Indicator Lights:
   • Look for any fault codes or indicator lights on the generator control panel. These can provide clues about specific issues.
5. Oil Level:
   • Check the oil level in the generator. Some generators have a safety feature that shuts them down if the oil level is too low.
6. Spark Plug:
   • Inspect the spark plug for fouling or damage. If needed, clean or replace the spark plug.
7. Fuel System Issues:
   • Inspect the fuel system for any leaks or issues. LP generators may have a fuel filter that needs to be checked and, if necessary, replaced.
8. Carburetor:
   • The carburetor may need cleaning or adjustment. If it's clogged, it can lead to stalling issues.
9. Battery Voltage:
   • Ensure that the generator's battery has sufficient voltage. A weak or dead battery can affect the starting process.
10. Generator Load:
    • If the generator is under a heavy load, it may shut down. Try starting it without any load and then gradually add loads.

Are you turning off the breakers before you start the generator?
Try this. If you still have problems, please let us know the generator make and model.

https://www.generatorguru.com

The circuit board that is under the start /stop switch on the generator has failed.

has it got fuel in it.

The AVR automatic voltage regulator normally gets damaged by a short in the rotor, wiring etc. MOST common is shutting the generator down under load and NO NO. The AVR goes wide open to try and maintain voltage on a gen that is stopping, always disconnect loads then shut off

UU is generator under voltage. Check to see if it does it without laod also. if it does you will need a pro to check and ohm the rotor and stator for shorts

Check for floating debris in fuel tank possibly restricting fuel flow thru screen on bottom of fuel pickup;

under warranty , you best have to wait the time as anything you do to fix it will void the warranty which will suit the service agent just fine
if you void the warranty he will get 2 hours travelling time plus the cost to repair time so don't touch it

http://www.cumminsonan.com/locator The A1 controller is likely suspect.