Captain
I have been having a problem with trying to replace a nexus controller on a liquid cooled, 22 kW, 1800rpm unit. The old controller failed by not grounding wire 23 for transfer.

Tried to put in a new one, same as the original, number 0H7668DSRV and after programming the install wizard, displayed the CanBus Error which can not be cleared. Nothing wrong with the fuses etc.

Put back in original and except for the transfer problem worked fine. Put in a panel from another 22, and it works fine.

Only the new panel will not work..........any ideas?

Thanks in advance
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BrentB
Should be a bulletin on that issue if I'm not mistaken. Sequence of plugging in J plugs.

Install wiz at is not the only programming you need to do. You have to configure the board for the exact unit you are installing it on.
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ohmslaw
Remove the t-1 fuse and disconnect the battery, install the controller reconnect the battery and power the T1.
Tim
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Captain
Thanks for the reply's,
I am not aware of a bulletin on this issue and do not find one either. Is powering down the t1 fuse and battery in a bulletin somewhere? Sounds like the sequence for getting around the error on the air cooled evolution controller replacement. I would like to find some type of difinitive answer before going all the way back out there but it's worth a try. Anyone know the bulletin number?
Thanks again
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ohmslaw
Captain;35182 wrote:
Thanks for the reply's,
I am not aware of a bulletin on this issue and do not find one either. Is powering down the t1 fuse and battery in a bulletin somewhere? Sounds like the sequence for getting around the error on the air cooled evolution controller replacement. I would like to find some type of difinitive answer before going all the way back out there but it's worth a try. Anyone know the bulletin number?
Thanks again


I do not know anything about a bulletin but my response was definitive.
Tim
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Peddler
Have you verified the engine parameters and V-code settings in the replacement controller? If you are getting a Canbus error then the controller thinks it has an external ignition module which is not he case with 4 cylinder engines. When you look at the engine size on the chart make sure you are using the code for the correct emissions, catalyst equipped or not. Good Luck, Peddler
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ohmslaw
Captain,
Did you get the controller to work?
Tim
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Captain
Funny you should ask, I was just getting here to post the end results to my problem.

So in the end, I tried the previous posting suggestions and all the possible combinations but the Canbus error would not clear out.

I put back in the previous controller and called Generac Tech and went over the problem again and the end result was them telling me I had purchased a bad controller.
So, I contacted the sales department where it was purchased and talked to them and the Tech. There, whom I know because he is also there teacher for Generac factory training, and he said the issue was one he was familiar with and it could, in most all cases, be corrected by entering the level II password at just the right instant. He said sometimes it has to be done just at the right moment before the error locks it out and offered to accept it back and he would check it and program it for me unless there was a problem with it.

Arrangements were made to get him the controller and he successfully did this and it was installed with no further problems. Because I was not personally the one who could take it up to him, I am waiting to hear the specifics on exactly how and at what point he was able to get the password entered and program it.

So, just to clarify the situation, the unit would start up once powered with the install wizard looking for the time and date etc. once this was done, and you pressed enter or escape or any key, the unit would immediately go into Canbus error alarm and no matter what key/keys or combination of them, or what order the plugs were connected, or what was powered down and the order it was powered back up, this would continue to happen and the alarm error could not be cleared. Therefore you could not check or change the programming because you could never get to it.
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ohmslaw
ohmslaw;35183 wrote:
I do not know anything about a bulletin but my response was definitive.
Tim


Definitive and apparently wrong.
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BrentB
Programming evolution board. If following the entire procedure and it still won't work? Gonna have to be a wiring harness problem
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