Properly functioning equipment optimizes airflow for your home. Plus, it helps minimize the energy your system wastes. However, various electrical issues or mechanical failures can affect your system’s performance. That’s where this guide comes in.
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We have categorized all the known reasons why your system is acting up. By the end of this guide, you’ll be able to decide the best course of action for your household. So, what causes my AC fan to stop spinning while the unit hums? Let’s find out.
As their name implies, the air conditioner fan and the fan motor work together to move air across your system’s coils. They come in a range of sizes to meet your specific HVAC system requirements. The benefits? They expel heat from the refrigerant, keeping your house cool during the brutal summer months.
But it has some drawbacks if ignored. A broken motor can cause the whole system to shut down. If the motor tries to turn but can’t, it creates a loud humming sound. This humming indicates that electricity is flowing into the motor, but the mechanical parts are stuck.
In fact, nearly 45% of summer AC breakdowns trace back to motor and power issues. Many of these breakdowns show early warning signs outlined in common signs of a malfunctioning AC unit.
Sometimes, when logging into your smart home app or our website to book a repair, you might see a screen performing security verification.
This verifies that you are a real user and helps protect the system from malicious bots. Once the security verification is complete and you see verification successful, you can access your thermostat settings or our contact page.
A security service might check your connection, and you may even see a response ray ID. While the page loads, don’t worry. It just blocks a bot from messing with your home’s energy settings. Once past verification, you can check whether your thermostat is actually sending the correct signal to the AC.
Think of a capacitor as a massive battery mounted inside your outdoor unit. It stores high voltage electricity to give the fan motor and compressor the massive jolt of power they need to start. If the capacitor goes bad, the motor doesn’t get that initial push.
So, it just sits there humming. Problems like this are often part of larger system failures discussed in AC won’t turn on helpful troubleshooting steps. You might even notice a burning smell or see that the top of the capacitor is bulging. Replacing this part requires the proper tools and the safe discharge of stored power.
Because of the high voltage, this is not a DIY fix. A professional from Green Street HVAC can safely handle the replacement and get your fan spinning again.
A clogged air filter restricts airflow. This lack of airflow means your system has to work overtime to pull air through it. Over time, this strain can cause the evaporator coil to freeze solid.
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When the coils freeze, the system can’t discharge cold air into your home. The extra strain can also cause the blower fan or the outdoor condenser fan motor to overheat and trip the circuit breaker.
Replacing your air filter every 30 to 90 days is a simple maintenance task that prevents major headaches. If you’re unsure when to replace it, check out how often AC filters should be changed for proper maintenance timing.
Incorrect thermostat settings can cause your AC unit to act strangely. If your thermostat is set to “heat” instead of “cool,” or if the temperature is set higher than the room temperature, the air conditioning system won’t run properly.
Always double-check your thermostat first. Make sure it is set to “cool” and the fan is set to “auto,” not “on.” If the thermostat batteries are dead, replace them. A simple fix here can save you a service call. Thermostat-related issues can also be explored in can a bad thermostat have heat but not cool.
If your system is humming, look at the fan blades. Are they obstructed by twigs, leaves, or debris? Sometimes a stick can fall into the outdoor unit and physically stop the fan blades from spinning. The motor tries to turn, but the physical blockage creates that humming noise.
Make sure you shut off the power at the breaker box before investigating. Never stick your hands near the blades while the power is on. If the blades spin freely when you push them with a stick (with the power off), the motor or the capacitor is likely the culprit.
There are other components to consider when your AC system is acting up. If you hear humming, it could also be a compressor that’s locked up. The compressor pumps the refrigerant through the system. If it fails, the whole unit will hum, but no cooling will happen.
Also, electrical issues like a tripped breaker or a blown fuse in the disconnect box can cause partial power loss. This means the unit hums, but there isn’t enough electricity to turn the fan. Regular maintenance helps catch these issues early, giving you peace of mind and protecting your investment.
Don’t let a humming AC ruin your comfort. Whether it’s a faulty capacitor, a stuck fan, or a frozen coil, the experts at Green Street HVAC can quickly diagnose and fix the problem. Schedule your AC repair today and get your home back to the perfect temperature. Your AC deserves the care it needs, and you deserve the cool relief you’ve been waiting for. Contact us now!
Our experts can walk you through every step of the way, from prospected which tailored solution would be best for you, to installing and maintaing it…
If you live in Nashville, Franklin, or Brentwood, the intense summer heat puts a heavy load on your AC. A humming unit usually points to a bad capacitor or a failing condenser fan motor. The system gets power, but the motor cannot physically start spinning. Contact Green Street HVAC for a quick diagnostic.
We highly recommend replacing a capacitor yourself. These components store high-voltage electricity, even when the power is shut off. Our Green Street HVAC technicians have the proper tools to safely discharge the energy and perform the replacement.
Yes. A severely clogged air filter restricts airflow, which can freeze your evaporator coil and overwork the entire system. Over time, this causes the unit to overheat or trip the breaker box. Homeowners in Hendersonville should regularly replace their filters to avoid these electrical issues.
This often indicates burning motor wires, a failing fan motor, or severe electrical issues. Contact Green Street HVAC right away so our experts can safely fix the broken components before they cause further damage to your furnace or AC unit.
From the way we insulate our ductwork, to the running of the copper refrigeration pipe – our quality is like no other. We spend as much time as we need to insure that our jobs are done perfect. When choosing Green Street you know the job will be done right – on time – and always within your budget.
Green Street’s certified technicians are experienced and trained to service, maintain, install and repair all makes and models of commercial air conditioning & heating equipment.
Each one of our lead technicians have years of experience in all aspects of HVAC service in Nashville. It is mandatory for each technician to complete a full in house training calendar to insure that they are up to date on the latest residential air conditioning & heating equipment.
