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Old 06-12-2017, 04:57 PM   #15
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With no coolant circulation it heats up real fast.
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Old 06-12-2017, 10:11 PM   #16
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I'm still kind-a wondering what the code is. I mean, NORMALLY, to get and desipher a code that is displayed, you will see a SERIES of flashes, then a pause, then another set of flashes. Then you determine the code by how many flashes are present. Just wondering, how you get a code from a single "flash"?
Scott
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Old 06-13-2017, 04:49 AM   #17
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I had the exact same issue on my entegra coach with Onan. Get the model and serial number call the cummins dealer and order the water temp sensor. Mine was about 35.00 and problem solved. When I called cummins they stated it was a fairly common item to fail. When going bad it allows system to start and then will go into protection mode within 2-3 minutes and turn itself off.
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Old 06-13-2017, 06:21 AM   #18
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..... Just wondering, how you get a code from a single "flash"?
Scott
Most likely by not following the manual. We still don't know the model number though.
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Old 06-13-2017, 06:25 AM   #19
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Here is an example of what you can find in the service manual. Of course, it's sometimes more fun to have us all just guess. Step away from the computer (unless looking at the service manual) follow the manual.......lol
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Old 06-13-2017, 08:09 AM   #20
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I'm still kind-a wondering what the code is. I mean, NORMALLY, to get and desipher a code that is displayed, you will see a SERIES of flashes, then a pause, then another set of flashes. Then you determine the code by how many flashes are present. Just wondering, how you get a code from a single "flash"?
Scott
My thoughts as well. That code just doesn't sound right.
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Old 06-13-2017, 03:10 PM   #21
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Update to everyone. Thank You for all of the input. I went and purchased a motorcycle jack this morn and dropped Gen out from under front of coach. I removed the temp sensor to discover that it had corroded in place. That explains the code as high temp upon start up. After visiting two different Kabota dealers with no luck (it has a Kobata engine in the ONAN) I have ordered the parts online.

My guess is the coach sat for a long period with no operation. Coach is 13 years old. It has 22,000 miles and the Gen has 119 hours. My guess is that this is just the beginning of my problems.
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Old 06-13-2017, 03:43 PM   #22
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....My guess is the coach sat for a long period with no operation. Coach is 13 years old. It has 22,000 miles and the Gen has 119 hours. My guess is that this is just the beginning of my problems.....
I suspect that if the average Onan was ran for a few hours everyday they would last a long time. They aren't so they don't.
It's great news that yours is producing the AC. That means that most likely the stator and rotor are good for now. Flight systems is great to deal with and they have even helped me through email. (without buying a part)

Thanks for the update and good luck!


p.s. When you get a new tool with a job it's not all bad!
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Old 06-14-2017, 09:15 AM   #23
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The troubleshooting guide for this ONAN explains that if the gen shuts down the start switch will flash a code.

A single flash means it shut down on high engine coolant temp
a double flash means low oil pressure.
if it flashes three times you push the switch to off momentarily and it will flash the two digit codes for a more in-depth guide.

My gen only flashed the one time when shutting down.
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Old 06-14-2017, 10:10 AM   #24
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The troubleshooting guide for this ONAN explains that if the gen shuts down the start switch will flash a code.

A single flash means it shut down on high engine coolant temp
a double flash means low oil pressure.
if it flashes three times you push the switch to off momentarily and it will flash the two digit codes for a more in-depth guide.

My gen only flashed the one time when shutting down.
Hey Sir,
Thanks for answering me (and others) on this. Most of us are not used to a single flash code. We're used to the series of flashes and a pause, then another set. Then the code is determined from the second set. Oh well, as long as it worked for you and you got your gen fixed, that's all that counts. For the record, I too had that infamous temp sensor go out. Fortunately ours is on a slide out tray so, while it was still a major pain in the a$$ to get it out and replaced, it was seriously easier than having to have to remove the gen completely to do the same job.
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Old 07-11-2017, 10:09 AM   #25
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well everyone. I have not replied to this post in a while. I still am yet to resolve my problem. Here is what I have done:

1. found faulty temp sensor that had corroded. I removed and replaced with new. I also removed and replaced thermostat. Generator started and ran 1.5 hrs. before shutting down with the same single flash code.

2. Pulled gen again and removed all of the cooling system parts i.e. radiator, water pump, thermostat, temp sensor. soaked radiator in vinegar water overnight to remove any corrosion. pump is good and impeller does not spin on shaft. It is firmly in place. Installed all parts back accept thermostat along with all new antifreeze. Gen ran 3 hrs and never shut down. I think its fixed and reinstall in coach.

3. Start out on vacation last week. Start gen on the road to run AC and it shuts down at 1.5 hrs. Now and also in previous events when restarted it will only run 10-15 min before next shutdown.

4. While on vacation I drained antifreeze and poured in some temp reducing fluid. ran gen 1 hr 3 times as directed to put several heat cycles into engine.

5. Start up gen and put AC load on unit. It runs 1 hr 20 min and shuts down on overheat same as all before.

What am I missing?
Did radiator clean out fix it and me removing thermos break it again?
Can this be due to a faulty computer?

It seems to take time for the temp to creep up to a point where it shuts down.

Any ideas will be eagerly accepted.
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Old 07-12-2017, 09:58 AM   #26
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well everyone. I have not replied to this post in a while. I still am yet to resolve my problem. Here is what I have done:

1. found faulty temp sensor that had corroded. I removed and replaced with new. I also removed and replaced thermostat. Generator started and ran 1.5 hrs. before shutting down with the same single flash code.

2. Pulled gen again and removed all of the cooling system parts i.e. radiator, water pump, thermostat, temp sensor. soaked radiator in vinegar water overnight to remove any corrosion. pump is good and impeller does not spin on shaft. It is firmly in place. Installed all parts back accept thermostat along with all new antifreeze. Gen ran 3 hrs and never shut down. I think its fixed and reinstall in coach.

3. Start out on vacation last week. Start gen on the road to run AC and it shuts down at 1.5 hrs. Now and also in previous events when restarted it will only run 10-15 min before next shutdown.

4. While on vacation I drained antifreeze and poured in some temp reducing fluid. ran gen 1 hr 3 times as directed to put several heat cycles into engine.

5. Start up gen and put AC load on unit. It runs 1 hr 20 min and shuts down on overheat same as all before.

What am I missing?
Did radiator clean out fix it and me removing thermos break it again?
Can this be due to a faulty computer?

It seems to take time for the temp to creep up to a point where it shuts down.

Any ideas will be eagerly accepted.
This whole situation really sucks. Sorry it is happening to you. Is it possible you have a bad thermostat/temp sensor? I realize you replaced it, but maybe you were unlucky and got a second bad one? Can you put in on a ohmmeter and make sure it you are getting the proper resistance settings vs. temperature?

When the generator shuts down, is it possible to get an accurate temperature of the coolant and see if the temperature is really in the range when there is supposed to be an auto shutdown? Maybe get one of those FLIR sensors and see what the temperature at the radiator fluid entrance and exit is?

Also, I thought I read a thread somewhere on this forum or another where the temperature sensor is in an area of the generator where there is really poor coolant circulation, leading to incorrect high temperature readings? Not sure what type of generator it was or what the details were. I just read it as a point of interest.

Can you run the generator (carefully!) with the temp sensor bypassed and see if the generator continues to run past this 1.5 hour mark?
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Old 08-01-2017, 08:16 AM   #27
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Could this be an exhaust obstruction?
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