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Old 07-20-2021, 03:47 PM   #1
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Brand: Thor Motor Coach
Model: ACE 29.4
State: Mississippi
Posts: 69
THOR #10956
5K Onan generator issue

I have a 2018 ACE 29.4 that came with the 5K Onan generator..

Two options to start generator (1) switch inside the RV (2) switch on generator

The generator light intermittently blinks 3 times on both inside and outside switches.

Outside
Generator will start 100% from switch on generator. Light blinking or not. It runs and powers as advertised. I have run for extended periods without issue.

From inside
If the light is blinking, I get nothing from panel (doesnít attempt to start)
If the light is not blinking, it starts no issues.

If the light is blinking and the RV is started outside, I can turn it off from inside and then it will restart 1 time from inside (regardless of where it is turned off)

I serviced the generator a couple months ago (oil/air) hoping this would stop the blinking but it didnít work.

Camping World (I understand most folks opinion of CW but they are 10 minutes from my house) can not diagnose the problem. They are guessing a voltage issue.

Good news is the generator runs great and itís just an inconvenience to have to go outside to start it, but I shouldnít have to. Any ideas of something I can check myself. I have a volt/amp meter and a basic understanding of electrical work.

Thanks. Bud

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Bud & Maria
2018 Thor ACE 29.4
2020 Jeep JLU Rubicon
(swapped out of 37' 5th wheel and Chevy 3500 DRW Duramax in Apr 18)
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Old 07-20-2021, 04:03 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 3,506
THOR #6411
Quote:
Originally Posted by EVMIII View Post
I have a 2018 ACE 29.4 that came with the 5K Onan generator..

Two options to start generator (1) switch inside the RV (2) switch on generator

The generator light intermittently blinks 3 times on both inside and outside switches.

Outside
Generator will start 100% from switch on generator. Light blinking or not. It runs and powers as advertised. I have run for extended periods without issue.

From inside
If the light is blinking, I get nothing from panel (doesnít attempt to start)
If the light is not blinking, it starts no issues.

If the light is blinking and the RV is started outside, I can turn it off from inside and then it will restart 1 time from inside (regardless of where it is turned off)

I serviced the generator a couple months ago (oil/air) hoping this would stop the blinking but it didnít work.

Camping World (I understand most folks opinion of CW but they are 10 minutes from my house) can not diagnose the problem. They are guessing a voltage issue.

Good news is the generator runs great and itís just an inconvenience to have to go outside to start it, but I shouldnít have to. Any ideas of something I can check myself. I have a volt/amp meter and a basic understanding of electrical work.

Thanks. Bud
Code 3 - Service Check

When you see this code, it indicates that there is a problem somewhere on your Onan generator. You will get 3 flashes then a pause, then 3 flashes, then a pause and on it goes till you press the button to get the secondary code.
The secondary code will give you the specific problem that is wrong with your generator
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2016 Hurricane 31S
1961 Rampside in tow
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Old 07-20-2021, 04:21 PM   #3
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Brand: Thor Motor Coach
Model: ACE 29.4
State: Mississippi
Posts: 69
THOR #10956
Thanks for the reply. I tried and CW tried to retrieve code but it would on keep blinking 3 times. No secondary code is available. Maybe thatís part of the overall program.
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Bud & Maria
2018 Thor ACE 29.4
2020 Jeep JLU Rubicon
(swapped out of 37' 5th wheel and Chevy 3500 DRW Duramax in Apr 18)
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