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Old 10-10-2020, 04:44 PM   #1
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Generator overheats

I just purchased 2000 Monaco Executive and when we checked it out the generator ran and seemed fine.

Tried running it today for an extended period of time and it shut off while driving down the highway and the outside temp was only around 73.

Got home and tried it again and it started up and then shut off after about 30 seconds. Was getting a single slow flash that is apparently an overtemp alarm.

Checked oil and it was clean and full and the coolant was full also good. Generator felt pretty hot, what else do I need to check. All help will be greatly appreciated.
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Old 10-10-2020, 04:45 PM   #2
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Forgot to say, it is a 10kw Onan quiet generator!
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Old 10-10-2020, 04:57 PM   #3
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What is the fuel level in the main tank. Many will not pull fuel once you are down to between 1/2-1/4 to empty.
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Old 10-10-2020, 05:04 PM   #4
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My 7000 did the same thing a couple times. First time the coolant level was below the fill line. Second time was shortlyafter buying fuel (last weekend) so I replaced the fuel filter and it ran all weekend and seems fine now. Replacing the DP engine fuel filters tomorrow just to be safe.
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Old 10-10-2020, 05:17 PM   #5
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What is the fuel level in the main tank. Many will not pull fuel once you are down to between 1/2-1/4 to empty.
Did the OP state he had an over temp code?

Might want to check the fan belt. They can glaze and slip. Might look good but slip and overheat.
Also, the panel on the generator next to the start switch. Remove that and you should find a radiator cap. Remove it and make sure you have coolant up to the cap. Also make sure the cap is in good shape.
I have Quietdiesel 75000 and love it. Great generators!
How many hours on the generator?
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Old 10-10-2020, 05:56 PM   #6
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I had just filled it up!
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Old 10-10-2020, 06:04 PM   #7
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My 7000 did the same thing a couple times. First time the coolant level was below the fill line. Second time was shortlyafter buying fuel (last weekend) so I replaced the fuel filter and it ran all weekend and seems fine now. Replacing the DP engine fuel filters tomorrow just to be safe.
Coolant level and cap look ok, I did just fill up the fuel tank, maybe stirred some trash up. Will try replacing the fuel filter.

Thanks for all the suggestions guy, I appreciate it.
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Old 10-10-2020, 11:40 PM   #8
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As mentioned above, how many hours?

It may be due for a new fan belt. Old belts will slip, and result in slow fan speed.
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Old 10-11-2020, 04:02 AM   #9
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As mentioned above, how many hours?

It may be due for a new fan belt. Old belts will slip, and result in slow fan speed.
Also don't forget to take a look at the radiator and make sure it is not plugged with dirt.

Bob
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Old 10-11-2020, 06:34 AM   #10
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You need to retrieve the actual error codes. The single slow flash just indicates there is one.
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Old 10-11-2020, 07:52 AM   #11
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You need to retrieve the actual error codes. The single slow flash just indicates there is one.

Yahtzee!


Now if were guessing?....I'll take overheat due to belt failure and it's going in to auto-shutdown protection mode. ( pretty common failure )


The fault codes IMC will lead you to the origins of the failure.


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Old 10-11-2020, 07:55 AM   #12
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Quote:
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Also don't forget to take a look at the radiator and make sure it is not plugged with dirt.

Bob
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You need to retrieve the actual error codes. The single slow flash just indicates there is one.
Thanks for the new advice! I will check the fan belt, and radiator today! Also going to re-inspect the radiator cap more closely.

The start button on the generator has an error code diagnostic chart beside it that says a single slow flash is an overheating issue. It has 3 other flash error codes 2 flashes, 3 flashes and continuous quick flashing which means it is preheating.
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Old 10-11-2020, 08:00 AM   #13
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Sorry! I keep forgetting to mention it has 608 hours on it!
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Old 10-11-2020, 08:14 AM   #14
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I had a similar problem the generator would run for a short time and shut down with an overheat code. I found that the water temp sensor was bad and changed it all has been good after I changed it. Seems like a problem with these generators.
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