Category: Generac Error Codes

The Generac Evolution 1.0 and 2.0 series, equipped with Honeywell Sync 2.0 or 3.0 controls, use error code 1400 to alert you when the engine temperature exceeds a critical threshold. This safety feature prevents damage by shutting the unit down if it detects overheating.

What Causes Error Code 1400?

The primary reason for this alarm is that the engine temperature sensor has detected excessive heat. This can happen if airflow is blocked, preventing proper cooling, or if the temperature sensor or its wiring is faulty.

Diagnostic Checklist

1. Inspect Air Vents: Check the generator’s air intake and exhaust vents for dirt, leaves, or debris that might restrict airflow. Clear any blockages carefully.
2. Verify Ambient Conditions: Ensure the generator is in a well-ventilated area and not exposed to direct sunlight or heat sources that could raise engine temperature.
3. Check Cooling Fan Operation: Listen for the cooling fan when the generator is running. If the fan isn’t spinning or sounds abnormal, it may need servicing.
4. Examine Temperature Sensor Wiring: Look for damaged, loose, or corroded wiring connected to the high temperature switch. Secure or replace as needed.
5. Test the High Temperature Switch: If you have a multimeter and are comfortable, test the switch for proper operation according to the manufacturer’s specs.
6. Review Oil Levels and Condition: Low or dirty oil can cause the engine to run hotter. Check and top off or replace the oil if necessary.
7. Restart the Generator: After completing these checks, reset the alarm and restart the unit to see if the issue persists.

When to Call a Pro

If you’ve cleared vents, confirmed good airflow, checked wiring, and the alarm remains active, it’s time to contact a professional technician. Also, call a pro if you notice any of the following:

• Frequent overheating alarms despite no visible blockages
• Signs of engine damage like smoke, unusual noises, or leaking fluids
• Difficulty diagnosing or testing electrical components safely
• Generator fails to restart after multiple reset attempts

Parts You May Need

• High temperature switch or sensor
• Replacement wiring or connectors
• Engine oil and oil filter
• Cooling fan or fan motor assembly
• Air filter (if airflow blockage is related to dirty filter)

FAQ

Disclaimer: This information is intended as a general guide. Always follow the specific instructions and safety recommendations provided in your generator’s manufacturer manual.

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

The Generac Evolution 1.0 and 2.0 series generators equipped with Honeywell Sync 2.0/3.0 controls use error code 1300 to indicate that the engine has detected low oil pressure. This is a safety feature designed to prevent engine damage by shutting down the unit if the oil pressure falls below a safe threshold.

What Causes Error Code 1300?

There are several reasons your generator could trigger this alarm:

• Low Oil Level: The most common cause is simply that the oil level is too low. This often happens during prolonged outages when the generator runs longer than usual without maintenance.
• Faulty Low Oil Pressure Switch: The sensor that detects oil pressure may malfunction, giving a false low-pressure reading.
• Internal Engine Problem: If the engine isn’t building oil pressure properly due to mechanical issues, the alarm will activate. This requires further testing.

Diagnostic Checklist

1. Check the Oil Level: Open the oil fill cap and use the dipstick to verify the oil level. Add the recommended oil type if it’s low.
2. Inspect for Oil Leaks: Look around the engine and oil pan for any visible leaks that could cause oil loss.
3. Reset the Generator: After topping off oil, reset the error code via the control panel and attempt to restart the generator.
4. Test the Low Oil Pressure Switch: If the alarm persists with proper oil level, the pressure switch may be faulty. This can sometimes be tested with a multimeter or by a technician.
5. Check Oil Pressure Mechanically: Use a mechanical oil pressure gauge to confirm if the engine is producing adequate pressure. This step typically requires professional tools.
6. Inspect Oil Filter and Oil Quality: Old or clogged oil filters and degraded oil can reduce oil pressure. Consider changing the oil and filter if maintenance is overdue.
7. Review Generator Runtime: Long runtimes without maintenance can cause oil degradation and pressure issues. Schedule regular oil changes per your manual.
8. Consult the Owner’s Manual: Follow any specific diagnostic steps or warnings provided by Generac for your model.

When to Call a Pro

If you’ve topped off the oil and the alarm continues, or if you notice any of the following, it’s time to bring in a qualified technician:

• Oil pressure tests show consistently low readings despite proper oil level.
• Visible oil leaks that you cannot fix yourself.
• Repeated false alarms indicating a faulty pressure switch.
• Any unusual engine noises, smoke, or performance issues accompanying the low oil pressure alarm.
• Difficulty resetting the alarm or restarting the generator.

Parts You May Need

• Synthetic or conventional engine oil (check your manual for the recommended type and viscosity)
• Oil filter compatible with your generator model
• Replacement low oil pressure switch
• Oil pressure gauge (for professional use or technician)
• Basic hand tools (wrenches, screwdrivers) for oil changes and inspections

FAQ

Disclaimer: This article provides general information about Generac error code 1300. Always refer to your specific generator’s owner’s manual and follow manufacturer guidelines for maintenance and troubleshooting.

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

The Generac Evolution 1.0 and 2.0 series standby generators with Honeywell Sync 2.0 or 3.0 controllers include a safety feature called the overspeed alarm, represented by error code 1207. This alarm is designed to protect your generator from damage caused by the engine running at unsafe speeds.

Understanding the Overspeed Alarm (Code 1207)

Normally, the generator’s controller monitors engine speed through ignition pulses received from an 18-wire harness. However, if these ignition pulses are not detected, the system uses a backup method to monitor engine speed. This backup uses the zero crossing timing of the voltage regulator’s output to estimate the alternator frequency, which correlates to engine RPM.

If the controller senses a frequency equivalent to 4500 RPM or higher for more than 150 milliseconds, it triggers the overspeed alarm (code 1207). This is a protective measure to prevent engine damage due to excessively high speeds.

Diagnostic Checklist

Before calling a technician, you can perform these basic checks to troubleshoot the overspeed alarm:

1. Reset the Generator: Turn off the generator and wait a few minutes before restarting. Sometimes, transient faults cause false alarms.
2. Inspect the Ignition Harness: Check the 18-wire ignition harness for loose or damaged connections that might prevent proper pulse detection.
3. Check for Engine RPM Anomalies: Listen for unusual engine noises or vibrations that might indicate the engine is actually running too fast.
4. Examine the Voltage Regulator Wiring: Look for damaged or loose wires connected to the automatic voltage regulator (AVR) that could affect frequency sensing.
5. Verify Battery Voltage: Ensure the generator’s 12V battery is fully charged and supplying stable voltage to the controller and ignition system.
6. Inspect for Mechanical Issues: Check the engine throttle linkage and governor for signs of sticking or misadjustment that could cause overspeed.
7. Review Recent Changes: Consider if any recent maintenance or environmental changes might have affected generator operation.

When to Call a Pro

If you notice any of the following signs, it’s best to contact a qualified generator technician right away:

• The overspeed alarm persists after resets and basic checks.
• You detect unusual engine noises, vibrations, or visible damage.
• The engine speed control or governor appears faulty or unresponsive.
• You find wiring damage beyond simple fixes or suspect internal controller faults.
• The generator shuts down unexpectedly or fails to start after the alarm.

Attempting to run the generator with a genuine overspeed condition can cause severe engine damage and safety hazards.

Parts You May Need

• Spark plug
• 12V battery
• Voltage regulator (AVR)
• Ignition harness (18-wire connector)
• Throttle or governor linkage components
• Wiring connectors and electrical tape

FAQ

Disclaimer: This article provides general information about Generac error code 1207. Always consult and follow the manufacturer’s manual and guidelines specific to your generator model.

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

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.