Generac generators are one of the most trusted choices when it comes to keeping your home or business powered during an outage. They are known for being reliable, efficient, and long-lasting.
On average, repairs can cost anywhere from around 100 dollars to more than 2,000 dollars depending on the problem, the type of generator, and who does the repair.
In this guide, you will find everything you need to know about repairing and maintaining your Generac generator. You will learn about common issues, real costs, and helpful tips to make your generator last longer and run more reliably.
Why Generac Generators Need Regular Maintenance
Generac generators can produce anywhere from 7 to 22 kilowatts for residential models and even more than 150 kilowatts for commercial use. They run on natural gas, propane, or diesel and are designed to handle tough conditions.
But like any machine, they are still affected by heavy use, sitting idle for long periods, or being exposed to bad weather. Moisture, dirt, and even small animals can cause damage. How well the generator was installed and how often it is serviced also play a big role in how long it will last.
Regular maintenance helps you avoid sudden failures and keeps your generator ready when you need it.
Your Generac generator isn’t working? Contact expert repair solutions today!
How a Generac Generator Works and Why It Can Fail
A Generac generator works by turning fuel into electricity through a small engine and an alternator. Here are the main parts of the generator and what they do, along with the most common problems with each part.
Before deciding on repairs, many homeowners ask, How much is a Generac generator? The cost of a new unit typically starts at $2,000, which might make replacement a better choice for aging models.
| Part | What it does | Common problems |
|---|---|---|
| Battery and starter motor | Starts the engine | Dead or weak battery, dirty connections |
| Control panel and sensors | Monitors and controls the generator | Faulty sensors, broken control board |
| Alternator and stator | Produces electricity | Burned windings, worn brushes |
| Automatic Transfer Switch (ATS) | Switches power from the grid to the generator automatically | Stuck switch or not switching properly |
| Fuel system | Supplies fuel to the engine | Blocked fuel line, dirty carburetor, bad fuel |
When one of these parts stops working properly, your generator may not start, it might shut off while running, or it might not produce steady power.
Signs Your Generator Needs Repair
You can often tell something is wrong with your generator before it completely stops working. Look out for these signs
- It struggles to start or does not start at all
- The control panel shows error codes (you can also check these using the Mobile Link app)
- It makes loud or strange noises like rattling or buzzing
- Lights in your house flicker or the power it produces feels weak
- You notice smoke, oil leaks, or a strong smell of fuel
- It seems to be using more fuel or oil than usual
If you notice any of these, it’s a good idea to have it checked before the problem gets worse.
Common Generac Generator Problems and How to Fix Them
Battery and electrical problems
The most common reason a generator won’t start is because of the battery. Batteries lose their charge over time or become corroded.
You can clean the battery terminals and replace the battery every three to five years to avoid this.
Fuel system problems
Fuel can become stale or get contaminated, and fuel lines or filters can get blocked. This makes it hard for the engine to get enough fuel.
Replace fuel filters, clean the carburetor, and use fresh, clean fuel to prevent this.
Control panel or sensor issues
If the control panel shows error codes or stops working, it may have a faulty circuit board or loose wires.
Try resetting it first. If it still doesn’t work, a technician should inspect it.
Alternator and transfer switch problems
If the alternator’s windings are burned or the brushes are worn, the generator won’t produce power.
If the automatic transfer switch is stuck, it won’t switch your power source correctly during an outage.
Both of these should be repaired by a professional.
How Much Does Generac Generator Repair Cost?
Here are some common repair costs based on the type of problem
| Problem | Estimated cost |
|---|---|
| Battery replacement | 100 to 300 dollars |
| Fuel system repair | 150 to 600 dollars |
| Control panel or circuit board repair | 500 to 1,200 dollars |
| Alternator repair | 600 to 1,500 dollars |
| Automatic Transfer Switch replacement | 800 to 2,000 dollars |
| General maintenance and tune-up | 150 to 500 dollars |
The cost of repair depends on what kind of generator you have, how powerful it is, how old it is, and whether it is still under warranty. Portable generators usually cost less to repair than large standby or commercial models.
If the repair costs more than half of what a new generator would cost, or if your generator is more than 10 or 15 years old, it may make more sense to replace it.
Should You Repair It Yourself or Call a Professional
There are a few simple tasks you can do yourself if you’re comfortable
- Replace the battery
- Change the oil and oil filter
- Clean or replace the air filter
- Reset the control panel
For more serious problems like fixing the alternator, repairing the control board, replacing the transfer switch, or handling wiring issues, it is better to hire a certified Generac technician.
You can find help near you by searching for Generac service centers or certified technicians in your area.
Maintenance Tips to Avoid Repairs and Save Money
Taking care of your generator regularly is the best way to keep it working and avoid big repair bills.
Here is a suggested maintenance schedule you can follow
| Task | How often |
|---|---|
| Run the generator and check for leaks | Every week |
| Inspect the battery and clean the terminals | Every month |
| Change the oil and filter, and test under load | Every three months |
| Have a professional inspection and replace spark plugs | Once a year |
It also helps to keep the generator clean and dry, record all maintenance in a logbook, and use the correct parts and fluids. Installing a carbon monoxide detector inside your home and keeping the area around the generator clear are also important for safety.
You can also sign up for Generac’s Guardian Service Plan, which includes regular professional maintenance.
Safety Tips for Working on Your Generator
- Always turn off the generator and disconnect it from the power supply before working on it
- Only work in a place with good ventilation to avoid breathing carbon monoxide
- Wear gloves and eye protection
- Use proper tools instead of makeshift ones
- Do not try to repair parts like the alternator, transfer switch, or circuit board if you are not trained to do so
When It’s Time to Replace Your Generator
If your generator is breaking down often or repairs cost more than half the price of a new one, it might be time for a replacement.
Here is the average lifespan of different types of generators
| Type | Lifespan |
|---|---|
| Portable | 10 to 15 years |
| Standby | 15 to 30 years |
Newer models also come with better fuel efficiency, quieter operation, Wi-Fi and Mobile Link features for monitoring, and longer warranties.
Frequently Asked Questions
How often should I service my Generac generator?
At least once a year or every 200 hours of use.
Why does my generator shut off after running for a few minutes?
This can happen if it overheats, runs low on oil pressure, or has a blocked fuel line.
Can I check my generator remotely?
Yes, you can use the Mobile Link app to check its status and see error codes.
Does Generac cover repairs under warranty?
Yes, if it is still within its two-to-five-year warranty or an extended service plan.
What is the average repair cost?
Depending on the problem, it can cost anywhere from about 100 dollars to over 2,000 dollars.
Conclusion
A Generac generator is a smart investment that keeps your home or business running when the power goes out. But like any machine, it needs care and attention to stay reliable.
By keeping up with regular maintenance and fixing problems early, you can save money and make your generator last much longer. If your generator starts showing warning signs, don’t wait too long. Call a professional to inspect and repair it so it’s ready when you need it most.
