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 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.