Generator Won't Start: The Most Common Culprit

A generator that fails to start is the most frequent and frustrating issue for homeowners. More often than not, the problem is simple and can be resolved with basic checks. First, verify the fuel level. It may seem obvious, but an empty tank is a common oversight. If the generator has fuel, check if the fuel valve is in the 'ON' position. Stale fuel is another major cause, especially if the generator has been sitting for months. Gasoline can degrade over time, clogging the carburetor and fuel lines. If you suspect stale fuel, you may need to drain the tank and carburetor and refill with fresh, stabilized gasoline. Also, check the generator's oil level. Most modern generators have a low-oil sensor that will prevent the engine from starting to avoid damage. Finally, ensure the ignition switch is on and the choke is in the correct position for a cold start. For standby generators, a dead battery is a frequent cause of starting failure. Check the battery terminals for corrosion and ensure it is fully charged.

Engine Starts But Runs Rough or Surges

If your generator starts but runs erratically, surging, or sputtering, the fuel system is again the most likely suspect. A clogged carburetor is the primary cause of a rough-running engine. This is often due to old fuel that has gummed up the small internal passages. Cleaning the carburetor can resolve this, but it can be a delicate task; if you're not comfortable doing it yourself, it's best to call a professional. A dirty or clogged fuel filter can also restrict fuel flow and cause the engine to run poorly. Replacing the fuel filter is a relatively simple and inexpensive maintenance task. Another potential cause is a dirty air filter. The engine needs a clean supply of air to run smoothly. Check the air filter and clean or replace it if it's dirty. Finally, check the spark plug. A fouled or damaged spark plug can cause weak ignition, leading to rough running. Replacing the spark plug is an easy and important part of routine generator maintenance.

Generator is Running But Not Producing Power

It can be alarming when your generator is running, but none of your appliances are receiving power. The first thing to check is the circuit breaker on the generator itself. It may have tripped due to an overload. Reset the breaker and try again, reducing the number of connected appliances. If the breaker trips again immediately, there may be a short in one of your appliances or extension cords. For standby generators, the automatic transfer switch (ATS) could be the issue. Check the ATS for any tripped breakers or error indicators. Sometimes, a generator can lose its 'residual magnetism,' which is necessary for the alternator to produce electricity. This can happen if the generator has been stored for a long time without being run. There are methods to 'flash the alternator' to restore magnetism, but this procedure can be dangerous if not done correctly and should be performed by a qualified technician. If you've checked the breakers and are still not getting power, it's time to call a licensed electrician to diagnose the problem.

When to Call a Licensed Electrician in Pittsburgh

While many common generator issues can be resolved with basic troubleshooting, there are times when you absolutely need to call a professional. If you are ever unsure or uncomfortable performing any maintenance or repair, it is always best to err on the side of caution. Electrical work can be dangerous, and generators involve both electricity and flammable fuel. You should call a licensed electrician if you suspect an issue with the automatic transfer switch, if the generator's main circuit breaker keeps tripping, or if you need to perform any complex repairs like cleaning a carburetor or flashing the alternator. For any issues related to the generator's connection to your home's electrical panel, a professional is required. At PEKC, our network of qualified electricians in the Pittsburgh area is ready to help with any generator service or repair needs, ensuring your system is safe, reliable, and ready for the next power outage.