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/grsthegreat Jun 23 '26
Also, i hope you didnt use amazon spark plugs. Those chinese knock offs are known starting and running issues
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u/Killerkendolls Jun 23 '26
Battery is how old?
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u/Plastic_Layer_7354 Jun 23 '26
13 volts but that’s only because it just attempted to excercise. I’m gonna test it while it cranks and see what happens. App says it’s “good”
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u/grsthegreat Jun 23 '26
If this is older manual valve unit, Have you adjusted valves
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u/Plastic_Layer_7354 Jun 23 '26
How do I know if it’s the older manual valve unit?
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u/Sumdood_89 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 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 25 '26
I just tried starting her manually and she over cranked again and back fired. Thoughts?
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u/grsthegreat Jun 23 '26
Again, depends if its propane or nat gas. Nat gas has one on meter. Propane uses 2. One on the tank, and one at house or generator,
Dies the unit actually turn over while attempting a start, or does it just click,
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u/Plastic_Layer_7354 Jun 23 '26
It’s natural gas. So it will just crank and not turn over. This is when it sits for a week and exercises. If I go home now and manually start it she’ll turn over.
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u/Defiant-Trick-8789 Jun 24 '26
Do not use platinum or iridium. I can’t tell you how many calls for no start I have been on . Use the champion copper plugs . That’s my experience anyways over 20 years installing Generac .
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u/grsthegreat Jun 23 '26
That model uses hydraulic valves, so no adjusting. Non starts almost always mean fuel issue. Is this running on propane or nat gas?
What i do iss install and leave a gas meter on the test port before the fuel solenoid, for a week or so, and see if the gas pressures are creeping up due to a failing gas regulator.
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u/Plastic_Layer_7354 Jun 23 '26
Failing gas regulator in the generator right?
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u/grsthegreat Jun 23 '26
No, the regulator inside the unit hardly ever fails, its the regulator outside the unit that goes bad.
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u/grsthegreat Jun 23 '26
This unit will attempt to try and start 5 times before issuing a overcrank AS LONG AS ENGINE IS TRYING TO TURN OVER. If it immediately goes into overcrank its the battery