Category: Generator Error Codes

What Code 15 Really Means

When your Cummins Onan generator displays Code 15, it’s telling you that the engine’s governor system is struggling to maintain the correct frequency (measured in Hertz, or Hz). In North America, household generators should run at 60 Hz. When the load on your generator spikes—say, when your air conditioner compressor kicks in—the engine speed can drop, and frequency falls below acceptable limits. The generator detects this and throws the alarm to protect your equipment.

Think of it like this: if you’re driving uphill and suddenly press the gas pedal harder, your car’s engine needs to work harder to maintain speed. Your generator’s governor works the same way. When too many appliances demand power at once, the engine can’t keep up, frequency dips, and the alarm activates.

Why This Happens

Code 15 almost always points to an overload condition. Your generator is rated for a maximum wattage output. When you connect appliances that together exceed that capacity—or when large motor-driven devices like air conditioners and battery chargers start simultaneously—the engine can’t spin fast enough to maintain frequency.

For LPG (propane) models, there’s a secondary cause: oil contamination in the fuel system. Over time, oil from the propane supply can migrate into your generator’s fuel lines and carburetor. This gums up the fuel delivery, making the engine less responsive and unable to accelerate quickly enough when load increases.

Diagnostic Checklist

1. Check your load. Make a list of every appliance currently running. Add up their wattages (check the nameplate on each device or the manual). Does the total exceed your generator’s rated output? If yes, you’ve found your problem. Unplug non-essential items and restart the generator.
2. Stagger high-demand starts. Air conditioners and large battery chargers draw huge inrush current when they first start. Never run both simultaneously. Turn on the AC, wait 2–3 minutes for it to stabilize, then plug in the battery charger. This spreads the load over time.
3. Reduce connected appliances. Even if individual items seem small, running the microwave, water heater, and lights all at once can push you over the edge. Unplug items you don’t need right now. Restart the generator and see if the alarm clears.
4. For LPG models: drain the fuel system. Locate the LPG drain valve on your generator (consult your manual for exact location—typically on the fuel line or carburetor area). Attach a small container and slowly open the valve. If oil or dark liquid drains out, this is your culprit. Close the valve tightly when done. Restart and test.
5. Check fuel level and quality. Low fuel can cause the engine to hesitate under load. Refill your tank. If you’re using old gasoline (more than 30 days old), drain the tank and refill with fresh fuel. Old fuel gums up the carburetor and reduces engine response.
6. Inspect the air filter. A clogged air filter starves the engine of oxygen, reducing power output. Remove the air filter cover (usually a few bolts or clips), pull out the filter, and hold it up to light. If you can’t see light through it, replace it. Even a slightly dirty filter can hurt performance under load.
7. Check the oil level and condition. Low or dirty oil reduces engine efficiency. Locate the dipstick, wipe it clean, reinsert it fully, then pull it out again to check the level. If it’s below the minimum mark, add the correct oil type (check your manual). If the oil is black or gritty, change it.
8. Verify battery voltage (if applicable). Some Cummins Onan models use a 12V battery for the governor control system. A weak battery can cause the governor to respond sluggishly. If your generator has a battery, check that it reads at least 12.6V with a multimeter when the unit is off. If lower, charge or replace it.

When to Call a Pro

Stop troubleshooting and contact a qualified technician if:

• You’ve reduced the load to well below the generator’s rated capacity, but Code 15 still appears.
• The alarm triggers even when only one small appliance is running (e.g., a single light or phone charger).
• You’ve drained the LPG fuel system and the problem persists on propane models.
• The engine sounds weak, sputters, or won’t accelerate smoothly even at idle.
• You notice fuel leaking from the carburetor or fuel lines.
• The governor control system appears damaged or the throttle linkage is bent or stuck.

Code 15 can also indicate internal engine wear, a failing governor actuator, or carburetor damage—all of which require professional diagnosis and repair.

Parts You May Need

• Air filter (engine-specific)
• Spark plug (engine-specific)
• Oil and oil filter (consult your manual for type and capacity)
• Fuel stabilizer or fresh gasoline
• 12V battery (if your model uses one)
• Carburetor rebuild kit (for LPG models with fuel contamination)

Frequently Asked Questions

Final Thoughts

Code 15 is your generator’s way of protecting itself and your appliances. It’s not a reason to panic, but it is a signal to take action. Start with the easiest fixes: reduce your load, stagger high-demand appliances, and perform basic maintenance. If those steps don’t resolve the issue, you’ve narrowed the problem down enough to hand off to a technician with confidence.

Disclaimer: This article provides general information about Code 15 alarms on Cummins Onan generators. Always consult your specific generator’s owner’s manual and follow the manufacturer’s recommended procedures for troubleshooting and maintenance. If you are unsure about any procedure, contact a qualified service technician. Improper maintenance or repair can result in equipment damage, personal injury, or death.

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

What Code 14 Actually Means

When your generator displays Code 14, it’s telling you that the engine frequency—essentially how fast the engine is turning—has climbed above the rated operating speed. In a properly functioning generator, an internal governor automatically adjusts fuel flow to keep the engine running at exactly the right speed. When Code 14 appears, that governor has lost the ability to control the engine’s RPM, and the engine is spinning faster than designed.

This is different from a simple overspeed shutdown. Code 14 is an alarm that indicates the governor itself isn’t responding correctly to bring the frequency back into the normal range. Left unchecked, an overfrequency condition can damage the alternator, stress internal engine components, and potentially create a safety hazard.

Common Causes of Code 14

Governor Control Cable Issues
The mechanical linkage that connects your governor to the fuel injection system can become loose, bent, or disconnected. Even a small amount of slack in this cable prevents the governor from properly throttling back the engine when speed increases. Over time, vibration and normal wear can gradually loosen these connections.

Fuel Injection System Problems
If the fuel injectors are stuck open or the fuel control system isn’t responding to governor commands, the engine will keep receiving too much fuel and continue accelerating. A stuck injector or a fuel control solenoid that has failed can lock the system into a high-fuel state.

Governor Spring Failure
The governor relies on internal springs to return to a neutral position when engine speed increases. If these springs weaken, break, or become stuck due to corrosion or debris, the governor loses its ability to regulate speed. This is an internal issue that requires professional service.

Air Intake Restrictions
A severely clogged air filter or blocked intake can sometimes cause unusual governor behavior. While less common as a sole cause of Code 14, a dirty air filter should always be checked as part of your diagnostic process.

Electrical Faults in Governor Control
Some Onan generators use electronic components to assist governor operation. A faulty sensor, corroded connector, or damaged wiring in the governor circuit can prevent the system from responding to speed changes.

Diagnostic Checklist

1. Check the air filter. Remove and inspect the air filter element. If it’s dark, clogged, or visibly restricted, replace it. A clean air filter is the easiest first step and costs just a few dollars. Run the generator for a few minutes after replacement to see if the code clears.
2. Inspect the governor control cable. Locate the mechanical linkage running from the governor to the fuel injection system (consult your manual for the exact location on your model). Look for loose bolts, bent brackets, or disconnected ends. Gently wiggle the cable to ensure it moves freely without binding. Tighten any loose fasteners with a wrench or socket set.
3. Check fuel quality and level. Stale or contaminated fuel can affect engine response. If your generator has been sitting for months, drain the old fuel and replace it with fresh gasoline or diesel (depending on your model). Make sure the fuel tank is adequately filled—a low fuel level can sometimes trigger unusual governor behavior.
4. Look for visible corrosion or debris. Inspect all visible governor linkages, springs, and connections for rust, dirt, or debris. Use a soft brush or compressed air to gently clean away any buildup. Do not force any corroded parts; if they’re stuck, this indicates internal damage requiring professional service.
5. Test under no-load conditions. If safe to do so, start the generator without any electrical load connected. Listen for unusual engine noise or vibration. A generator that runs smoothly at idle but exhibits Code 14 under load may have a different root cause than one that shows the error immediately. Document what you observe.
6. Check all electrical connections. Examine the battery terminals, alternator connections, and any wiring harnesses related to the governor system for corrosion, loose terminals, or damaged insulation. Clean corroded terminals with a wire brush and tighten any loose connections.
7. Review your maintenance history. If the generator has not been serviced recently, the governor system may simply need professional cleaning and adjustment. Note the hours on your generator and when it was last serviced by a technician.

When to Call a Pro

Stop troubleshooting and contact an authorized Cummins Onan dealer immediately if you observe any of the following:

• The engine continues to accelerate even after you move the load control or throttle to the lowest setting.
• The Code 14 alarm persists after you’ve checked the air filter, fuel, and visible linkages.
• You notice the governor cable is bent, kinked, or visibly damaged.
• The engine makes grinding, knocking, or unusual metallic noises while Code 14 is active.
• The generator shuts down abruptly or the frequency fluctuates wildly between high and low.
• You see fuel leaking from the injection system or governor area.
• Any internal governor components appear corroded, stuck, or broken when you inspect them.

Continuing to operate a generator with an unresolved Code 14 can damage the alternator windings, stress the engine block, and potentially create a fire hazard. Professional service is not optional in these cases—it’s a safety requirement.

Parts You May Need

• Air filter element
• Fresh fuel (gasoline or diesel, depending on your model)
• Fuel filter (if your model has a replaceable cartridge)
• Governor control cable (if the existing one is damaged)
• Fuel injector cleaning kit or replacement injectors
• Governor spring kit (if internal springs have failed)
• Electrical connectors and wiring harness repair kit

Frequently Asked Questions

Disclaimer

This article provides general information about Cummins Onan Code 14 and is intended for educational purposes only. It is not a substitute for your generator’s official manual or professional service. Always consult the manufacturer’s documentation for your specific model before attempting any repairs or maintenance. If you are unsure about any step, contact an authorized Cummins Onan dealer. Improper diagnosis or repair can result in equipment damage, personal injury, or fire hazard.

For detailed technical specifications and official guidance, refer to the Cummins Onan service documentation available at cummins.com.

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

What Code 13 Means

When your Cummins Onan generator displays Code 13, the onboard controller is signaling an undervoltage condition. This means the generator’s output voltage has dropped below the rated level it’s designed to maintain. Unlike a complete shutdown, Code 13 is an alarm—your generator is still running, but the electrical system is stressed.

The root cause is almost always excessive electrical load. Your generator has a maximum power output (measured in watts or kilowatts). When the combined demand from all connected appliances exceeds what the unit can safely deliver, voltage sags. This is especially common when high-inrush devices like air conditioners and battery chargers start up simultaneously.

Why This Happens

Generators don’t have infinite power reserves. Each model is rated for a specific maximum output. When you connect appliances, they draw current from that pool of available power. Some devices—particularly motor-driven equipment—demand a large surge of current at startup. Air conditioners and battery chargers are notorious for this.

If your total connected load exceeds the generator’s capacity, the voltage regulator cannot maintain the proper output voltage. The controller detects this drop and triggers the Code 13 alarm to protect your equipment from damage due to low voltage.

Think of it like a water system: if too many faucets run at once, the pressure drops. Your generator’s voltage works the same way.

Diagnostic Checklist

1. Check your generator’s rated capacity. Look at the nameplate on your unit or consult your owner’s manual. Write down the maximum kW or kVA rating. This tells you the absolute ceiling of power available.
2. List all connected appliances and their power draw. Check the labels on major devices (air conditioner, refrigerator, water heater, battery charger, microwave). Most appliances show watts or amps. Add them up. If the total exceeds your generator’s rating, you’ve found the problem.
3. Turn off the air conditioner and battery charger. These are the most common culprits. Restart the generator. If Code 13 clears, you’ve confirmed the issue is load-related, not a mechanical fault.
4. Stagger high-power device startup. Don’t start the AC and battery charger at the same time. Turn on one, wait 30 seconds, then turn on the next. This spreads the inrush current over time and prevents voltage collapse.
5. Reduce overall connected load. Unplug non-essential devices. Turn off space heaters, water heaters, or other resistive loads that aren’t critical. Aim to stay 20–30% below your generator’s rated capacity for safe operation.
6. Inspect fuel level and fuel quality. A generator running on low fuel or degraded fuel cannot maintain proper voltage regulation. Fill the tank and ensure fuel is fresh (less than 30 days old for gasoline, or use fuel stabilizer for longer storage).
7. Check for loose connections at the generator terminals. Corroded or loose battery cables and output terminals increase resistance, causing voltage drop. Clean any corrosion with a wire brush and tighten all connections firmly.
8. Verify the generator is running at full throttle. Some models have a choke or throttle control. If the engine is running slowly, it cannot generate rated voltage. Ensure the throttle is set to full speed and the engine is warmed up.

When to Call a Pro

If you’ve followed the diagnostic checklist and Code 13 persists even with minimal load connected, the problem may be internal:

• The voltage regulator is faulty and cannot maintain output voltage even at light load.
• The alternator or generator head is failing.
• Internal wiring or connections are corroded or damaged.
• The engine is not running at full RPM due to carburetor, governor, or ignition issues.

Also seek professional help if you notice:

• Code 13 appears even when only one appliance is running.
• The generator sounds rough or is misfiring.
• You smell fuel or see fuel leaking.
• The unit shuts down unexpectedly after the alarm appears.

Parts You May Need

• Fuel stabilizer (for old fuel)
• Wire brush or battery terminal cleaner
• Fresh gasoline or diesel (depending on your model)
• Replacement fuel filter (if fuel quality is suspect)
• Voltage regulator (if diagnosis points to regulator failure)
• Alternator or generator head (in rare cases of internal failure)

Best Practices to Avoid Code 13

Once you’ve resolved the immediate alarm, adopt these habits:

Know your limits. Keep a list of your generator’s rated capacity and major appliance power draws posted near your electrical panel or generator. Before plugging in a new device, check if it will fit within your available capacity.

Prioritize critical loads. Decide which appliances are essential (refrigerator, water pump, heating/cooling) and which are optional (entertainment, non-essential chargers). Run essential loads first, then add optional loads only if capacity allows.

Use a heavy-duty extension cord with a power meter. A plug-in watt meter (available at hardware stores) lets you measure real-time power draw. This takes the guesswork out of load management.

Maintain the generator regularly. Clean fuel, fresh oil, and a clean air filter ensure the engine runs at full efficiency. A weak engine cannot generate rated voltage.

Avoid simultaneous startup of large motors. If you must run both an air conditioner and a water heater, start them 30–60 seconds apart. This prevents the inrush current spike that triggers Code 13.

FAQ

Disclaimer

This article provides general information about Code 13 on Cummins Onan generators. It is not a substitute for your generator’s owner’s manual or professional service. Always refer to the manufacturer’s documentation for your specific model before attempting repairs or modifications. If you are unsure about any diagnostic step, consult a qualified technician. Improper generator operation or maintenance can result in equipment damage, personal injury, or property loss.

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

What Causes Code 29?

Cummins Onan generators monitor battery voltage continuously. When the voltage climbs above 19 volts, the system triggers an alarm and stops the generator to protect the battery and electrical components. This almost always comes down to one of two issues: the batteries are wired incorrectly, or the charger is set too aggressively.

Most RV and standby generators run on a 12-volt battery system. If those batteries accidentally get connected in series (end-to-end, like a flashlight), the voltage doubles to 24 volts—well above the 19-volt threshold. Even if they’re wired correctly in parallel, a boost-charge setting that’s too high can push voltage into dangerous territory.

Diagnostic Checklist

1. Check the battery connections visually. Open the battery compartment and look at how the cables connect. In a parallel setup, both positive terminals connect together, and both negative terminals connect together. In series, one positive connects to the other battery’s negative, then the remaining positive and negative go to the generator. If you see the series configuration, that’s your problem. Take a photo if you’re unsure, and compare it to your owner’s manual.
2. Measure the battery voltage with a multimeter. Set a digital multimeter to DC voltage and touch the red probe to the positive battery terminal and the black probe to the negative. A healthy 12-volt battery system should read 12.5 to 14.5 volts at rest. If you’re seeing 19+ volts, the charger is overcharging. If you’re seeing 24+ volts, the batteries are in series.
3. Review the battery boost-charge rate setting in the generator menu. Access the control panel (usually a small LCD screen on the generator or a remote panel in your RV). Navigate to battery settings or charger settings—the exact path varies by model. Look for “boost charge,” “charge rate,” or “battery voltage set point.” If it’s set to maximum, try reducing it by one or two levels and restart the generator.
4. Verify the battery bank size and type. Check your owner’s manual or the battery labels. Cummins Onan systems are designed for specific battery capacities. If you’ve recently added extra batteries or replaced them with a different type, mismatched batteries can cause voltage regulation problems. Mixing old and new batteries, or different brands, sometimes causes issues too.
5. Inspect battery cables for corrosion or loose connections. Even if the wiring diagram is correct, a corroded or loose connection can cause the charging system to “see” a false voltage reading. Clean any white, blue, or green corrosion off the terminals with a wire brush and a baking soda solution. Tighten all cable connections by hand, then with a wrench if needed.
6. Check for a faulty battery charger or regulator. If voltage is still climbing after you’ve confirmed correct wiring and reduced the boost setting, the internal charger or voltage regulator may be failing. This is not a DIY fix—you’ll need a technician to test or replace the charging module.
7. Confirm the generator software is current. Some Cummins Onan models have firmware updates that fix voltage-regulation bugs. Check the manufacturer’s website or contact a dealer to see if your model has any available updates. A technician can usually apply these during a service visit.

When to Call a Pro

Stop troubleshooting and contact a qualified technician if:

• You measure voltage consistently above 19 volts even after reducing the boost-charge rate to its lowest setting.
• The batteries are correctly wired in parallel, but the alarm keeps returning after a restart.
• You notice the battery getting hot to the touch, or you smell rotten eggs (a sign of battery acid boiling off).
• The generator won’t start at all, or starts but immediately shuts down with the Code 29 alarm.
• You’re uncomfortable opening the battery compartment or using a multimeter.

A technician can test the internal voltage regulator, charger module, and battery health with specialized equipment. They can also reprogram the generator’s settings if needed.

Parts You May Need

• Digital multimeter (to measure voltage)
• Wire brush (to clean corroded terminals)
• Battery cable terminals and connectors (if existing ones are damaged)
• 12-volt deep-cycle battery (if one battery is failing)
• Replacement charger or voltage regulator module (if the charging system is faulty)

Quick Reference: Series vs. Parallel Wiring

Parallel (Correct for 12V systems): Both batteries’ positive terminals are connected together, and both negative terminals are connected together. Voltage stays at 12 volts, but capacity (amp-hours) adds up.

Series (Wrong for 12V systems): The positive of one battery connects to the negative of the other, then the remaining positive and negative go to the generator. Voltage doubles to 24 volts—this will trigger Code 29.

Always check your owner’s manual for the correct wiring diagram for your specific model. When in doubt, take a photo of the current setup and have a technician verify it before you reconnect anything.

Frequently Asked Questions

Can I ignore Code 29 and keep running the generator?

No. The alarm exists to prevent battery damage and potential electrical fires. Overcharging a battery can cause the electrolyte to boil, the case to crack, or the battery to explode in extreme cases. The generator will shut down automatically when it detects the fault, so you won’t have power anyway. Fix the root cause first.

Why would my batteries be wired in series if that’s wrong?

Sometimes a previous owner or technician made a mistake during installation or repair. Or, if you’ve recently replaced a battery, the new one might have been connected incorrectly. It’s also possible that the wiring was correct at first, but a loose connection caused someone to re-wire it incorrectly as a “fix.” Always verify against the manual.

Is a boost-charge rate ever supposed to be on maximum?

Boost charge is useful when the battery is deeply discharged and you want to charge it quickly. However, most Cummins Onan systems default to a moderate rate that’s safe for long-term use. If you’ve set it to maximum and never lowered it, that’s likely your culprit. Try a lower setting and monitor the battery voltage for a few charge cycles.

What’s a safe battery voltage for my generator?

A healthy 12-volt battery system should idle between 12.5 and 14.5 volts. When the generator is running and actively charging, it may climb to 14.5 to 15 volts briefly, but it should not exceed 16 volts during normal operation. Anything above 19 volts is a clear sign of overcharging and will trigger Code 29.

Disclaimer: This article provides general information for educational purposes and is not a substitute for your generator’s owner’s manual or professional service. Always consult the manufacturer’s documentation for your specific model before attempting repairs. If you are unsure about any step, contact a qualified technician or your generator’s dealer. Improper battery handling or electrical work can result in injury, fire, or equipment damage.

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

What Code 35 Means

When your Cummins Onan generator displays Code 35, it’s telling you that the microprocessor’s internal memory (called EEPROM) failed a diagnostic check. Think of the EEPROM as the control card’s permanent storage—it holds the instructions and settings the generator needs to start and run. If that memory becomes corrupted or unreadable, the control card shuts down the generator to prevent damage.

This is a serious alarm, not a warning. Your generator will not start or run while Code 35 is active. The control card is essentially saying, “I can’t trust my own memory, so I’m stopping everything until this is fixed.”

What Causes Code 35

Control card memory failure can happen for several reasons:

• Power surges or electrical spikes: A lightning strike, utility fault, or sudden voltage surge can corrupt the microprocessor’s memory.
• Age and component wear: EEPROM chips can degrade over time, especially in generators that run frequently or in harsh environments.
• Manufacturing defect: Rarely, a control card ships with a faulty memory chip.
• Loose or corroded connections: Poor electrical contact between the control card and the generator’s wiring harness can cause intermittent power to the microprocessor, corrupting data.
• Overheating: If the generator runs in extreme heat or the control card enclosure is blocked, heat stress can damage the EEPROM.

Diagnostic Checklist

Before you call an authorized dealer, try these steps in order. They’re listed from cheapest and easiest to more involved.

1. Check the display and note the exact code. Make sure Code 35 appears consistently, not intermittently. Write down when it appeared and what the generator was doing (starting up, running under load, etc.). This information helps the technician.
2. Perform a soft reset. Turn off the generator’s main disconnect switch, wait 30 seconds, then turn it back on. Sometimes a transient glitch can be cleared by a clean restart. If Code 35 clears and doesn’t return, monitor the unit closely over the next few days.
3. Inspect the control card enclosure for water or corrosion. Open the generator’s control panel (consult your manual for the exact location and procedure). Look for moisture, rust, or white/green corrosion on the circuit board or connectors. If you see water inside, the unit needs to dry out and may need professional cleaning. Do not attempt to dry it with heat; let it air-dry in a warm, dry place for 24–48 hours, then try again.
4. Check all visible wiring connections to the control card. Look for loose, corroded, or disconnected terminals. Gently wiggle connectors (with the generator off) to ensure they’re fully seated. Corrosion can be cleaned with a small brush or contact cleaner, but be careful not to damage delicate pins.
5. Verify the generator has adequate ventilation. Make sure cooling air can flow freely around the control card enclosure. Remove any debris, leaves, or obstructions. If the generator is in a confined space, move it to a well-ventilated area and try a restart.
6. Check for recent electrical storms or power anomalies. If Code 35 appeared right after a lightning strike, power outage, or utility work in your area, a surge may have damaged the control card. This is a strong indicator that the card itself needs replacement.
7. Attempt a manual reset if your model supports it. Some Onan generators allow you to clear fault codes via a menu option on the display. Consult your owner’s manual for the exact procedure. This rarely works for Code 35, but it’s worth trying if the option exists.

When to Call a Pro

Contact an authorized Cummins Onan dealer immediately if:

• Code 35 persists after a soft reset and the steps above.
• You see water, corrosion, or burn marks inside the control card enclosure.
• The code appeared after a lightning strike, power surge, or electrical storm.
• The generator has been in service for many years (10+) and Code 35 is your first major fault—the control card may simply be worn out.
• You are uncomfortable opening the generator’s control panel or inspecting electrical connections.

Code 35 almost always requires control card replacement. This is not a repair that homeowners should attempt, as it involves microprocessor-level diagnostics and reprogramming. An authorized dealer has the tools and firmware to replace the card and ensure it’s properly configured for your specific generator model.

Parts You May Need

If the control card must be replaced, the dealer will supply and install:

• Replacement control card (specific to your model)
• Wiring harness connectors (if damaged)
• Thermal paste or sealant (for enclosure resealing)

You typically cannot order these parts yourself; they must be sourced and programmed by an authorized dealer.

Frequently Asked Questions

Final Notes

Code 35 is one of the more serious faults your Onan generator can report, but it’s also one of the most straightforward to diagnose: the control card has detected a problem with itself and is shutting down to protect your equipment. In most cases, the solution is a replacement control card from an authorized dealer.

If you’ve recently experienced a power surge, lightning strike, or water exposure, Code 35 is almost certainly the result. If the code appeared out of the blue on an older generator, the control card may have simply reached the end of its service life.

Always consult your generator’s owner’s manual for model-specific information and procedures. This article provides general guidance; your manual is the authoritative source for your equipment.

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