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Onan RV QG 4000 power issue


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09-24-14, 05:52 PM   #1  
Onan RV QG 4000 power issue

My Onan generator is 2 years old with 530 hours; the generator will cut off when the air conditioner is turned on. AC will run on shore power with no issues; generator puts out 126 volts, 62 htz. I have changed the rotor, brush block and brushes but did not help. I had a tech at Camping World check it out and said the board was OK and that I needed to change the rotor. (did not work)

 
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09-24-14, 05:59 PM   #2  
Welcome to the forums.

Is this a gasoline or propane unit ?

 
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09-24-14, 06:42 PM   #3  
What are the specs for the a/c, make, model and nameplate amps.
Which sub model is it? (PDF Link to specs)


GregH.........HVAC/R Tech

 
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09-25-14, 05:06 AM   #4  
You say the generator "cuts off" when the AC turns on. Does that mean the engine quits running or the engine continues to run but the generator is not outputting electricity?

 
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09-25-14, 06:30 PM   #5  
The generator is gasoline powered. When you turn the AC on, the transfer switch starts clicking and the motor/generator shuts down. The AC unit is a Dimetic; cools good no issues with motor or start capacitor. Pulls <18 amps at initial start then pulls 10-12 amps running. The AC runs good on shore power; I have also plugged the shore power into a 4100 watt Makita generator and pulls the AC with no problem.

 
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09-26-14, 08:17 AM   #6  
You say the engine "shuts down". Does it sound like it's being shut down or does it sound more like it's being dragged down by too heavy a load?

 
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09-26-14, 06:25 PM   #7  
The generator & engine shut down as a safety fault. when the thermostat is turned on the generator never idles up; the generator sounds as if it is under a load.; the lights in the coach get dim and the generator dies.

 
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09-27-14, 04:33 AM   #8  
So it sounds like it's not an engine problem but probably something in the controls.

 
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