robtlhughes
I give up. I have a 15 kw, liquid cooled Generac Guardian Generator, Model # 560047220A. The circuit board was damaged. I had it repaired and then also bought a new one. With either board, the generator works fine in manual, and it will start automatically and pick up the load in automatic.

But the exercise cycle is messed up. It won't set and run a week later. If I force it to start by pushing the little button on the circuit board, it starts but won't stop after 20 minutes, or ever. After I turn it off and then put it in automatic, it will start.

The only way to stop from starting up in automatic is to disconnect then reconnect the battery. Then it works fine except for the exercise cycle. It behaves the same with the rebuilt board and the brand new board.

Nothing I've tried or that has been suggested has worked. Beyond swapping parts, the generator people do the basics. How can I find someone who understands the electronics of this genertator? Guardian hasn't been much help help. Thanks.
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Skip Douglas SkipD
First, let us know where you are. Second, if you are out of range of Ziller Electric's techs and nobody has any ideas for dealers in your area, contact Kelly Myers at Ziller Electric for a recommendation of a dealer in your area or maybe get you in touch with a contact inside Generac.
Skip Douglas
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Gman1
If this unit has the 76009 control board, you have a blown fuse/ no voltage in the gen on L1/L2 or the exercise switch is bad.
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bronco
Ok I need the model number that starts with 20A not the backwards number you have posted then I can find the drawing and parts for your unit and get some ideas as where to go. I sounds like you have a 76009 control PCB but when you remove the batt. power it resets the board and all is ok except the exercise. So it can't be fues's or no voltage on L1-L2. I would think that there could be a problem with the other side of the exerciser switch or the auto-off-manual sw.
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robtlhughes
Generator info

Hi, Thanks for the help. My model is (SG) 0047220. The board is a 076009A. I replaced the exercise switch, and, as you said, all the fuses are fine. Same result when I press the exercise button on the board; It runs but won't stop after 25 minutes. If I stop it manually and then put it in auto, it starts up again. To reset it, I have to not only disconnect the battery but also disconnect both wiring harnesses to the board. Once I get it back together, all is well--except for the exercise cyle. I have the wiring diagram, but an baffled. Thanks again.
Bob
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Gman1
L1 and L2 only exist to keep the exerciser portion of that board working. If you have L1 and 2 power all the way to the board, the exerciser switch is working properly, and the generator operates properly except exercise...you have a bad board. It wouldn't be the first time I have seen a bad new board, and I have never had any luck with rebuilt 76009 boards. The only other thing I can think of is your "on off manual" switch may have an issue.
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robtlhughes
On-off-auto switch

Thanks. When the rebuilt board didn't work on the exercise cycle, I broke down and bought a new board. It is a later version of the board (076009A Rev. F) on my 2002 generator., though I don't think it should make any difference. The result was the same as on the rebuilt board: works fine except on the exercise cycle. I guess I'll look at the switch. Thanks again. Bob
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GEI3137
Check voltage on T1 & T2 from terminal strip to generator should be 230 volts
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Skip Douglas SkipD
GEI3137;9967 wrote:
Check voltage on T1 & T2 from t/s to generator should be 230 volts
I do not understand what you are saying. What is a "t/s"? What do you measure?
Skip Douglas
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ohmslaw
Skip,
My guess is t/s = transfer Swith
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GEI3137
I was suggesting checking for 230 volts from T1 & T2 located in transfer switch terminal strip TS3 to generator which is connected to terminal 17 & 18 on control board located in generator.You will find T1 & T2 in generator next to L1 & L2 on terminal strip.
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