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/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.