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Old 09-04-2013, 04:02 PM   #1
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Onan Quiet 7500 Generator

Does anybody have a clue as to what is happening to my generator. It started up and ran fine for about an hour or more and then shut off. I pushed the start button and it started up and ran fine for about a minute or two and shut off, it will do this over and over. So, I went outside to the generator and it was blinking a code of 3, 3 which is 33. So I looked it up and it was for coolant or the cap. The coolant is fine. I cleaned the filter. But it still does the same. Runs and shuts off. Can anybody help before I take it to Camping World and is something simple. I have almost a full tank of fuel. Thanks Don
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Old 09-04-2013, 04:11 PM   #2
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Try removing the coolant fill cap and run the genset and see if trapped air is expelled. Have you recently drained and refilled the coolant? If so, trapped air can prevent a full fill and you may be getting a low coolant shut down.

Now, if you have not recently drained coolant, you may have a failing temp sensor. Onan QD gensets have a sensor installed in a fitting at the top rear of the engine that, when it fails, will tell the genset it is overheating when it is not and will shut down. If that is the issue, the top of the genset will need to be removed to get to the sensor for replacement.

Just a suggestion but I would not take your QD to Camping World for service unless you have prior experience with them and trust them. From my experience, they do not generally have the skills to do much other than very minor work. Your best bet is to find a Cummins Coach Care or Cummins/Onan shop and have them take a look at the genset.
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Old 09-04-2013, 04:26 PM   #3
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Smlranger, thank you for your input. That two that says failed temp switch. So, I guess I off to the repair shop. They never make it easy for the owner. They seem to think if you have a nice RV your pockets must be deep and full of cash. . Thank you all for your inputs. Friends helping friends.
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