7 common generator problems and how to fix them

Generators can be real lifesavers, especially when the power goes out or you’re off the grid. But like any machine, they can throw a tantrum now and then. Knowing the typical generator glitches and how to sort them out can save you time and keep everything running smoothly. Let’s take a look at some usual generator issues and how you can fix them to get your power back on track.

The info we’re sharing might not fit your exact generator model. While we aim to give helpful tips for all kinds of DIY repairs, different models might have their own quirks with troubleshooting steps, error codes, parts, etc. For the best advice, we recommend checking your manufacturer’s manual for your specific model or get in touch with us if you’ve got questions.

1. Doesn’t start up

One of the most frustrating problems is when your generator just won’t kick into action. This issue can pop up for several reasons:

Possible culprits:

• Low on fuel
• Controls set to “off” or “reset”
• Dead or weak battery
• Clogged fuel lines
• Bad spark plugs

How to fix it:

1. Check the fuel: Make sure your fuel tank isn’t empty. Top it off if needed, and use fresh fuel to avoid contamination.
2. Inspect the controls: Double-check that all the generator’s controls are set correctly. Reset them if they’ve been tripped.
3. Test the battery: Use a multimeter to see if the battery voltage is up to snuff. If it’s below 12.6 volts, you might need a new battery.
4. Swap out spark plugs: Pull out the spark plugs to see if they’re worn out or dirty. Replace them if they look worse for wear.
5. Clean the fuel lines: If fuel isn’t reaching the engine, the lines might be blocked. Disconnect them and give them a good cleaning.

2. Starts then stalls

If your generator fires up but then dies shortly after, it might be because of:

Possible causes:

• Faulty spark plug in gas generators
• Loose or corroded electrical connections
• Issues with the governor system controlling engine speed
• Problems with voltage regulators or alternators

What to do:

1. Check the spark plug: A bad spark plug can make the engine stall. Replace it if needed.
2. Tighten up connections: Look over all the wiring for any loose or rusty connections. Clean off any corrosion and make sure everything’s snug.
3. Adjust the governor: The governor keeps the engine speed in check. See if there are any mechanical issues or misalignments and adjust as necessary.
4. Look at voltage regulators and alternators: These might need professional tools to test properly. If you think there’s an issue, it might be time to call in a pro.

3. Overheating

An overheating generator isn’t good news and can even be dangerous. Common reasons include:

Reasons why:

• Low coolant levels
• Leaks in coolant lines or hoses
• Clogged radiators

Fix-it tips:

1. Add coolant: Check the coolant level and top it up if it’s low.
2. Repair leaks: Inspect all hoses and lines for leaks. Replace any that are damaged to stop fluid from escaping.
3. Clean the radiator: Dirt and gunk can block the radiator fins. Use compressed air or a soft brush to clean them gently.

4. Uneven power output

Fluctuating power can be harmful to your devices. Causes might be:

Potential issues:

• Loose or corroded electrical connections
• Generator is overloaded
• Engine speed isn’t right
• Worn-out voltage regulators

How to handle it:

1. Tighten connections: Give all the wiring a once-over. Clean off corrosion and make sure everything’s connected firmly.
2. Lighten the load: Unplug any non-essential devices to avoid overloading. Check your generator’s wattage rating to manage the load properly.
3. Adjust engine speed: You might need to tweak the governor system to get the engine RPMs back where they should be.
4. Test the voltage regulator: Testing this part might need some special equipment. If you think it’s acting up, consider reaching out to a professional for help.

5. Wet stacking

“Wet stacking” happens in diesel generators when unburned fuel and oil build up, causing inefficiency.

Why it happens:

• Running the generator with a light load, leading to unburned fuel and oil accumulation

How to fix it:

1. Burn off the excess: Run the generator with a higher load to increase the temperature and burn off any residue.
2. Keep up with maintenance: Schedule regular checks to catch and fix issues early.

6. Running but no power

If your generator is humming along but not delivering electricity, possible reasons include:

Possible causes:

• Tripped circuit breakers
• Problems with voltage regulators

Steps to take:

1. Reset circuit breakers: Find the generator’s circuit breaker and reset it if it’s tripped.
2. Check the voltage regulator: If the generator runs but doesn’t produce power, the voltage regulator might be the culprit. It could be time to consult a pro for testing and possible replacement.

7. Low power output

If the generator’s running but not giving you enough juice:

Likely reasons:

• Generator is overloaded
• Internal alternator issues

What you can do:

1. Reduce the load: Unplug devices you don’t need to prevent overloading. Check your generator’s wattage limit to manage the load right.
2. Check the alternator: Look for signs of wear or damage. Testing it properly might require a professional, so consider reaching out if you suspect problems.

Wrapping up

For more detailed repair tips, check out our repair help section.Remember, giving your generator a little TLC can extend its life and make sure it’s ready to go when you need it most.

Need a hand or looking for specific parts? AppliancePartsPros.com is here to help you find exactly what you need to keep your generator humming.

Stay in the loop with more appliance repair tips and updates:

Follow us on Facebook and Twitter.

If you’ve got questions or need more assistance, don’t hesitate to reach out to our customer support team.