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Old 11-19-2017, 03:41 PM   #1
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2005 Country Coach Inspire330

We have a 7.5 Onan generator that runs for 2 to 3 minutes then cuts off. The fault code is 24 for the second code and 3 for first, any help out there.
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Old 11-19-2017, 03:54 PM   #2
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Don't have my Onan manual handy. Maybe someone else has it. If not, I can check it for you later. Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 11-19-2017, 09:32 PM   #3
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Hi


Sorry I can’t help with your question

this place is great

Safe travels
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Old 11-19-2017, 09:44 PM   #4
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I don't know your model specifically but I have read that code 24 occurs when "controller did not sense a temperature change during the first 5 minuets of operation". This means that you likely need a new coolant sensor as it's not responding to the temperature increase in your coolant. You could get into an overheat condition without knowing it so the engine shuts off to protect you.
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Old 11-19-2017, 09:56 PM   #5
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Does the generator run longer that the 2-3 minutes if you have turned off the breakers on the genset?
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Old 11-19-2017, 10:07 PM   #6
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Glad to have you here in the forum with us. You're gonna like it here.

Happy Trails!!!
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Old 11-20-2017, 11:51 AM   #7
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7.5 generator, 2005 country coach

Thanks for the relies on the generator problem, there is not a heat problem when the generator is running, we put an infrared scanner to monitor the radiator and the engine. Is there any way the cooling sensor could be bypassed to prove that is the problem, where would the sensor be located. It is a 2005 country coach inspire 330.

Thanks
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Old 11-20-2017, 07:44 PM   #8
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It's not that the engine is getting too hot. It's that the sensor is not communicating with the controller and telling the controller that it's getting warmer like is should when it's running. A typical bench test of a sensor like that is to put it in hot water and measure the electrical response as it heats up. I suppose that it could also be that the wiring between the sensor and the generator controller is fouled up.
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Old 11-20-2017, 07:55 PM   #9
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If it is a faulty temp sensor, you can get to it by removing the top of the generator enclosure. If your generator is on a slide you may be in luck. If it is not, you will have to drop the genset out the bottom of the coach to get to any of the interior components.

If it is on a slide and you can get the top off, you will see the temp sensor in the top of the fill neck near the back of the enclosure (on top of the Kubota engine). I would suggest you soak that thing well with a good penetrant before you attempt to remove it. It can be sort of corroded in place.

I did a full service on the 7.5 Onan on my previous coach and I had to heat the temp sensor with a propane torch, followed by spraying it with Deep Creep, to get it out. That was on a Winnebago Journey and I had to jack up the coach and drop the generator out the bottom with a motorcycle jack.
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Old 11-21-2017, 08:57 AM   #10
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7.5 onan generator country coach

thanks for the replies, is there anyway to bypass the sensor on this coach.
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Old 11-21-2017, 10:25 AM   #11
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Quote:
Originally Posted by ddeaton View Post
thanks for the replies, is there anyway to bypass the sensor on this coach.
ddeaton,
First off, like SML stated, it's located on back side of the engine, in the lower section of the thermostat housing, no the fill neck. I'm assuming SML meant the T-stat housing. And yes, it can be one serious pain in the a$$ to remove or, it can spin right out. It's about the size and shape of a lawn mower spark plug.
There is a way to "trick" the Kubotas ECM into thinking all is well. You simply purchase a new sensor and, remove the sensor wire from the top of the present sensor and, attach it to the new one. Then, simply tape the new sensor the the radiator hose that enters the top of the T-stat housing. The new sensor picks up the temp of the coolant through the radiator hose. It's by far, not the smartest way to remedy this problem as, it's not accurate and, complications can occur.
I myself have never done this procedure. I did a monster write up with photos on the replacement of this sensor. Mine was one of those that simply fought me from the first minute to the last. And, like SML, I eventually had to heat my broken off sensor, with a propane torch and, then spray the sensor with some "Freeze" . After that procedure, it spun right out.

But, the SMARTEST thing for you to do is, get in there and replace it, don't jury-rig it. Yeah, it's gonna be a pain but, that's motorhoming.

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Old 11-21-2017, 10:29 AM   #12
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Scott is correct about the exact location of the sensor. It has been some time so I couldn't remember. Regardless of how you fix it, you have to get the top off that enclosure to get to it.
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