Generac error code 1100 means your generator’s engine is cranking but failing to start, usually due to fuel supply or maintenance issues.
If your Generac Evolution 1.0 or 2.0 series standby generator shows error code 1100, labeled as “Overcrank,” it indicates the controller is attempting to start the engine but the engine isn’t firing up. The system confirms the starter motor is turning the engine over, but the engine doesn’t catch and run. This is a common alarm that usually points to problems with fuel delivery or routine maintenance items.
What Causes Overcrank (Error Code 1100)?
The most frequent reasons for this error are:
- Empty or shut-off fuel supply: If your generator runs on propane (LP gas), the tank might be empty or the valve closed. For natural gas, the supply could be interrupted.
- Fuel system blockages or leaks: Clogged fuel filters or faulty fuel lines can prevent proper delivery.
- Maintenance-related issues: Dirty spark plugs, old fuel, or valve problems can keep the engine from starting.
- Starter motor protection: On 8kW and 9kW models, the controller limits the number of start attempts to 10 to avoid damaging the starter. If it reaches this limit, the alarm triggers.
Diagnostic Checklist
Before calling a technician, try these steps in order to potentially fix the issue yourself:
- Check the fuel supply: Ensure your propane tank has gas or natural gas is flowing. Open any closed valves.
- Inspect fuel lines and connections: Look for leaks, kinks, or blockages in the fuel hose or piping.
- Examine the fuel filter: Replace it if it looks dirty or clogged, as restricted fuel flow can prevent starting.
- Test the battery voltage: A weak 12V battery may crank but not provide enough power for ignition.
- Check spark plugs: Remove and inspect for fouling or wear; clean or replace as needed.
- Verify oil level and quality: Low or dirty oil can cause engine protection circuits to prevent starting.
- Reset the controller: Power down the generator and restart after a few minutes to clear temporary faults.
- Review maintenance history: If valves or other engine components haven’t been serviced recently, schedule maintenance.
When to Call a Pro
Contact a qualified generator technician if you notice any of the following:
- The generator repeatedly fails to start even after fuel and battery checks.
- You smell fuel leaks or detect strong propane odors near the unit.
- The error code persists after resetting the controller multiple times.
- There are unusual noises during cranking or visible engine damage signs.
- You are uncomfortable performing fuel system or electrical checks yourself.
Parts You May Need
- Fuel filter
- Spark plug
- 12V battery
- Oil filter
- Engine oil
- Fuel line or hose (if damaged)
FAQ
What does the Overcrank error code 1100 mean on my Generac generator?
It means the generator’s engine is turning over but failing to start, often due to fuel issues or maintenance needs.
How can I fix the Overcrank error myself?
Check your fuel supply, inspect fuel lines and filters, verify battery condition, and ensure spark plugs and oil are in good shape.
Why does my Generac limit the number of start attempts?
To protect the starter motor from damage, the controller restricts start attempts to 10 on certain models before triggering the Overcrank alarm.
When should I call a professional technician for error 1100?
If the generator keeps failing after basic checks, you detect fuel leaks, or feel unsure about troubleshooting fuel or electrical systems, call a pro.
Disclaimer: This information is general guidance only. Always follow the manufacturer’s manual and safety instructions for your specific Generac model.
Source: Information adapted from official manufacturer documentation (reference). Always consult your generator owner’s manual for model-specific procedures.