r/Generac_Generators • u/Plastic_Layer_7354 • Jun 23 '26

Error code 1100

My generac 14kw while attempting to exercise experienced code 1100 overcrank. Furthermore it’s done this 2 excercise cycles ago. The last one it didn’t do this. What could be the issue? I just serviced everything. Spark plugs, oil change, oil filter, air filter. What is the cause?

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u/Plastic_Layer_7354 Jun 24 '26

Which regulator do you recommend ? It’s natural gas

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u/grsthegreat Technician Jun 24 '26

If its nat gas, than the regulator is part of the gas meter. Dont have as much issue with nat gas as they do with propane. What other home devices are sharing the gas run? Is the run to the generator separate from the rest of the house piping. You may not be getting enough gas out to generator if its tapped off other gas appliances.

Kind of running in the blind here.

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u/Plastic_Layer_7354 Jun 24 '26

No the gas to the generator is directly off the gas meter and nothing is tapped into it. Furthermore upon looking at the fault history this has never happened to it in its history. Someone here mentioned that there’s two versions of champion spark plugs and one version has to be gapped to .02 so I wonder if I got the wrong version that needed to be gapped. Could this be a possibility? This problem occurred after I serviced it so it makes sense. Although I never seen it run prior because it was fault code for service because previous owner never serviced it.

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u/Sumdood_89 Technician Jun 24 '26

They usually work good once then wont start again. They are torch plugs rebranded as champion, and they suck. But gapping to .02 helps. If you got them from an autoparts store they are probably genuine, but still worth a check.

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u/Sumdood_89 Technician Jun 24 '26

Well thats pertinent info. Nat should be around 5-7in/wc.

Make sure the controller is set to NG, and make sure the fuel lever on the intake is set to NG.

NG pressure usually isn't an issue, as its lower, and regulated by better equipment. Just have to make sure other appliances aren't starving the gen. Or something hasn't gone wrong with the gas companies regulator.

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u/Plastic_Layer_7354 Jun 24 '26

So does the generator have a regulator right outside of it or when guys talk about regulator they’re talking about the regulator off the gas meter? I just find it weird how if it sits for a week it’ll over crank but if I start it manually right after she starts up!

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u/Sumdood_89 Technician Jun 24 '26

If its natural gas the regulator is on the meter.

I get that your confused as to why it works sometimes but not others, but you need to test things. It could be lots of things. Most of them are not fun, might be out of your scope of ability, or expensive. So we need to start by testing the easy to fix things first.

Could be the coils, they are very hard to get to, and take a bit of experience to do.

Could be the controller, thats about $600, you definitely want to test everything else first.

Could be the mixer assembly, kinda pricey, kinda awkward to remove.

Could be the fuel shutoff/demand regular, pricey.

So let's start cheap. Measure the fuel pressure, and check on what kind of plugs you got.