Top 5 Common AC Problems and How to Fix Them

During the hot summer months, it is essential to have a functional air conditioning (AC) system for maintaining a comfortable indoor environment. AC units, like any other intricate mechanical system, can encounter a multitude of issues that have the potential to disrupt their performance and hinder their efficiency. Understanding common AC problems is crucial for homeowners and business owners alike, as it enables them to identify and address issues promptly, saving both time and money.

PartsHnC is your one-stop solution for all your HVAC needs. We offer a wide inventory of HVA parts which include but are not limited to air conditioner thermostats, ac relay switches, compressors, evaporator coils, and air filters from top-selling brands like Lennox, Carrier, Trane, etc at competitive prices. Browse our inventory today!

Read this article to find out the top five common AC problems and solutions to fix them. Whether you’re facing issues with inadequate cooling, strange noises, or high energy consumption, this guide will help you diagnose and resolve these problems efficiently.

5 Common AC Problems and How to Fix Them

It is widely understood that a malfunctioning air conditioning system has the ability to induce discomfort and inconvenience, leading to undesirable circumstances. If you encounter issues with your AC unit, it’s helpful to have some knowledge about common air conditioner problems and their solutions. 

Here are the five common AC problems and solutions on how to fix them:

  • Poor Airflow

Poor airflow can result in reduced cooling efficiency in your air conditioner. Several factors can contribute to this issue, including clogged air filters, a blocked AC relay switch, or a malfunctioning blower motor. To address this problem, follow these steps:

  1. Check and clean the air filters: Dirty or clogged filters restrict airflow. Regularly inspect the filters and clean or replace them as needed. This simple step can significantly improve your AC’s performance.
  2. Clear blockages around vents: Ensure that furniture, curtains, or any other objects are not blocking the supply and return vents. Unblock these areas to allow unrestricted airflow.
  3. Inspect the blower motor: If you suspect the blower motor is malfunctioning, consult a professional technician to inspect and repair or replace it if necessary.
  4. Inspect the AC relay switch: Inspect the AC relay switch, which controls the fan motor. If the switch is faulty or damaged, it may impede proper airflow. In such cases, replacing the relay switch is recommended. Consult a professional technician for assistance if needed.
  • Refrigerant Leaks

Refrigerant leaks can cause your AC system to lose cooling capacity and result in warm air blowing from the vents. Detecting and fixing AC refrigerant leaks is crucial for restoring your AC’s performance. Here’s what you can do:

  1. Look for signs of AC refrigerant leaks: Oftentimes, AC refrigerant leaks are accompanied by hissing sounds, oily residue around the unit, or a sudden decrease in cooling performance. If you notice any of these signs, it’s likely a refrigerant leak.
  2. Call a professional technician: Fixing AC refrigerant leaks requires expertise and specialized equipment. Seeking the assistance of a certified HVAC technician is crucial in order to accurately pinpoint and address any refrigerant leaks in AC unit. These experts possess the necessary skills to effectively repair the leak and restore the refrigerant to its appropriate level.
  • Electrical Malfunctions

AC units rely on electrical components to function properly. Malfunctions in these components can lead to various air conditioner problems, including the system not turning on or erratic cooling. If you suspect an electrical issue, follow these steps:

  1. Check the circuit breaker: Start by inspecting the circuit breaker or fuse box. In the event that the breaker associated with your AC unit has tripped or a fuse has blown, it is recommended to reset the breaker or replace the fuse. However, if the issue persists despite these actions, it is advisable to consult a professional electrician who can provide further guidance.
  2. Inspect the wiring and connections: Visually inspect the wiring and connections of your AC unit. Loose or damaged wires can cause electrical malfunctions. If you notice any issues, call a professional technician to address them.
  • Frozen Evaporator Coil

An AC frozen evaporator coil represents a frequently encountered issue, often resulting from restricted airflow or insufficient levels of refrigerant. When the coil freezes, your AC system may not cool effectively or may stop working altogether. To resolve ac evaporator coil frozen issue, take the following steps:

  1. Turn off the AC: If you notice a frozen evaporator coil, turn off the AC unit immediately. Continuing to run the system can cause further damage.
  2. Allow the coil to defrost: Leave the AC system turned off and allow the evaporator coil to defrost naturally. This process may take several hours or even a day. Once defrosted, check the air filters and vents for any obstructions that could be restricting airflow.
  3. Address the underlying issue: If the coil continues to freeze after defrosting, it may indicate a more significant problem, such as a refrigerant leak or a faulty blower motor. Contact a professional technician to diagnose and repair the issue.
  • Thermostat Issues

A malfunctioning air conditioner thermostat can result in temperature inconsistencies or even prevent the AC system from turning on. 

Troubleshoot the following to address ac thermostat not working issues:

  1. Check the power source: Ensure that your thermostat is receiving power. If it runs on batteries, replace them. If it’s hardwired, check the circuit breaker or fuse box.
  2. Verify the thermostat settings: Make sure that your air conditioner thermostat settings are correct. Check that it’s set to the “cooling” mode and that the temperature is set to a level that’s lower than the current room temperature.
  3. Inspect the thermostat wiring: Loose or damaged wiring can cause the thermostat to malfunction. Inspect the wiring connections. Even if you notice that your ac thermostat not working, call a professional technician to address them.

Top Air Conditioner Brands in 2023

When it comes to choosing an air conditioner for your home or office, it’s essential to consider the top brands that offer reliable performance, energy efficiency, and cutting-edge features. In 2023, several brands emerged as leaders in the air conditioning industry. Here are some of the top air conditioner brands to consider:


Lennox is a renowned brand known for its high-quality and innovative air conditioning systems. They offer a wide range of products, including central air conditioners, ductless mini-split systems, and heat pumps. Lennox air conditioners are known for their energy efficiency, advanced technologies, and quiet operation. For any repairs or replacements, you can find genuine Lennox parts to ensure optimal performance at PartsHnC.


Carrier offers a diverse range of products, including central air conditioners, ductless systems, and packaged units. They are known for their energy efficiency, advanced filtration systems, and quiet operation. Their smart connectivity features, allow users to control their cooling systems remotely.


Trane offers a comprehensive range of air conditioning solutions, including central air conditioners, heat pumps, and ductless systems. Their air conditioners are known for their durability, energy efficiency, and advanced features. They incorporate innovative technologies to provide precise temperature control, humidity regulation, and air purification.


Rheem-Ruud is a trusted brand that offers a wide selection of air conditioning systems designed for both residential and commercial applications. They provide various types of air conditioners, including central AC units, packaged systems, and ductless mini-splits. Rheem-Ruud air conditioners are known for their high efficiency, reliable performance, and advanced features such as smart thermostats and zoning capabilities.

As we have discussed the common AC problems from refrigerant leaks to faulty capacitors and clogged air filters, each issue has its own troubleshooting steps. However, it is crucial to remember that professional assistance should be sought whenever necessary, as complex problems may require specialized knowledge and tools. Schedule routine inspections and cleaning to prevent future air conditioner problems and ensure optimal performance of your air conditioning systems. Stay cool and enjoy the comfort of a well-functioning AC!


How do I fix an AC that is not cooling?

Check the thermostat settings, clean or replace the air filter, and ensure proper airflow around the unit to fix an AC that is not cooling.

How often should I replace my AC filter?

AC filters should typically be replaced every 1 to 3 months, depending on usage and filter type.

Can I repair a refrigerant leak in my AC system myself?

Repairing a refrigerant leak in an AC system is not recommended as it requires specialized knowledge and equipment. It’s best to consult a professional HVAC technician for assistance.


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