Tag: Generac

The Generac 1200 error code is an overspeed alarm that signals your generator’s engine frequency has exceeded safe limits for more than three seconds. This means the engine is spinning faster than it should—above 72Hz on a 60Hz model (common in the US) or above 60Hz on a 50Hz model (used in other countries). This prolonged overspeed condition can cause serious damage if not corrected promptly.

The most common cause of this overspeed is a problem with the generator’s stepper motor or mixer assembly. These components regulate the engine speed by controlling the fuel and air mixture. If the stepper motor becomes unplugged, stuck, or malfunctions, it can cause the engine to rev too high.

Diagnostic Checklist

1. Inspect the Stepper Motor Connection: Check that the stepper motor plug is securely connected. A loose or unplugged connector can cause overspeed.
2. Look for Physical Obstructions: Examine the mixer assembly for any debris or jams that could prevent proper movement.
3. Reset the Generator: Turn the unit off, wait a few minutes, and restart to see if the error clears.
4. Check Engine Oil Level: Low oil can cause engine performance issues; ensure oil is at the recommended level.
5. Inspect the Air Filter: A clogged air filter can affect engine speed control; clean or replace it if dirty.
6. Verify Battery Voltage: A weak 12V battery may cause erratic control signals; test and recharge or replace as needed.
7. Review Control Board Connections: Look for loose or corroded wiring around the control board and stepper motor.
8. Consult the Owner’s Manual for Specific Reset Procedures: Follow any model-specific steps recommended by Generac.

When to Call a Pro

If you’ve completed the above checklist and the overspeed alarm persists, or if you notice any of the following, it’s time to contact a professional technician:

• The generator engine runs at dangerously high speeds immediately upon startup.
• You hear unusual noises such as rattling or knocking during operation.
• The unit frequently shuts down or fails to start after the overspeed alarm.
• There are visible signs of damage or burnt components near the stepper motor or control board.
• You are uncomfortable performing electrical or mechanical inspections yourself.

Parts You May Need

• Spark plug
• Oil filter
• 12V battery
• Stepper motor or mixer assembly (replacement recommended by a technician)
• Air filter

FAQ

Disclaimer: This article provides general information about the Generac 1200 overspeed error code. Always refer to your generator’s specific manufacturer manual for detailed troubleshooting and safety instructions.

Source: Information adapted from official manufacturer documentation (reference). Always consult your generator owner’s manual for model-specific procedures.

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:

1. Check the fuel supply: Ensure your propane tank has gas or natural gas is flowing. Open any closed valves.
2. Inspect fuel lines and connections: Look for leaks, kinks, or blockages in the fuel hose or piping.
3. Examine the fuel filter: Replace it if it looks dirty or clogged, as restricted fuel flow can prevent starting.
4. Test the battery voltage: A weak 12V battery may crank but not provide enough power for ignition.
5. Check spark plugs: Remove and inspect for fouling or wear; clean or replace as needed.
6. Verify oil level and quality: Low or dirty oil can cause engine protection circuits to prevent starting.
7. Reset the controller: Power down the generator and restart after a few minutes to clear temporary faults.
8. 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

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.