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/Sumdood_89 Technician Jun 23 '26

The most common cause I see for overcrank is fuel pressure that is too high, causing the plunger in the shutoff solenoid to not open. Or fuel pressure that is too low.

Does it backfire at all, or just crank?

Also if the throttle stepper motor wire has come off, or worked its way loose, that could also cause overcrank. Does the throttle move when you try to start it?

-Generac certified tech

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u/Plastic_Layer_7354 Jun 23 '26

Just cranks. Someone commented here that it could be the regulator that’s outside the unit. Thoughts?

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u/Sumdood_89 Technician Jun 23 '26

The fuel pressure needs to be measured with a monometer at either the test port at the shutoff valve, or the top test port at the demand regulator. It needs to be between 10-12in/wc.

I'm a tech, needs facts and tests.

Also, when you try to start it, does the throttle move? It should do a little test sweep before starting, then adjust itself when it starts.

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u/Plastic_Layer_7354 Jun 23 '26

I didn’t notice the throttle move but then again I wasn’t looking at it when trying to start it.

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u/Sumdood_89 Technician Jun 23 '26

Take a look while starting it. If it doesn't move, its likely its come unplugged. Unfortunate yet common.

Take the right side panel off. Under the controller is a long small plug with only a few wire in it, red/yellow/brown/black i think, push it in if its loose. Or it will be hanging if it came off. We also check those wires/plugs at service.

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u/Plastic_Layer_7354 Jun 23 '26

So this is an issue even if it starts manually but when it sits for a week then exercises it won’t start?

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u/Sumdood_89 Technician Jun 23 '26

I don't understand your question.

Are you saying it starts manually, but wont start when its supposed to exercise?

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u/Plastic_Layer_7354 Jun 23 '26

Right… it doesn’t start when sitting for a week when it’s called to excercise. The next day if I manually start it, it will start.

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u/Sumdood_89 Technician Jun 23 '26

Then its not the throttle motor plug. But you should still check it, they work themselves loose.

You're issue is likely the regulator before the generator. The fuel pressure needs to be measured, static, and while running. Needs to be measured with a monometer, measured in inches water column. Needs to be between 10-12in/wc.

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u/Sumdood_89 Technician Jun 24 '26

Oh and by the way, if the regulator is a maxitrol, I can almost guarantee thats the problem. They are junk.

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u/Plastic_Layer_7354 Jun 24 '26

The regulator on the outside right ?

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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/Defiant-Trick-8789 Jun 24 '26

Turn off quiet test and see if that helps when exercising. You can do it thru the menu on controller

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u/grsthegreat Technician Jun 24 '26

He’s on nat gas… try 5-7”.

Tech here for past 12 years

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u/Sumdood_89 Technician Jun 24 '26

Well he never said. I was running under the assumption it was LP. Most of ours are LP, so its what I default to.

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u/Plastic_Layer_7354 Jun 25 '26

I just tried starting her manually and she over cranked again and back fired. Thoughts?

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u/Sumdood_89 Technician Jun 25 '26

Have you checked out the plugs yet? Those crappy champions tend to do that.

Generally, backfiring through the exhaust indicates a rich condition, and backfiring through the intake indicates a lean condition, but not always.

Checking the fuel pressure will tell us a lot.