AC Repair: Common Issues and How to Address Them (2024)

by Above All Media

Ever found yourself wondering why your air conditioner isn’t working as efficiently as it should, especially during those scorching summer days? You’re not alone. Air conditioning issues are common, but knowing what typically goes wrong can save you time, money, and a lot of discomfort.

From refrigerant leaks and faulty wiring to inefficient cooling and loud noises, the range of potential problems can be broad. The good news is, many of these issues can be addressed with straightforward solutions, whether it’s a simple filter change or a professional repair.

Understanding these common setbacks not only helps you diagnose problems more accurately but also empowers you to take the necessary steps to ensure your AC unit is in top working condition. This brief guide will explore the typical issues that plague air conditioners and provide practical advice on how to address them effectively.

What are common AC repair issues?

Common AC repair issues often involve a few key components and operational challenges that can affect the efficiency and performance of your air conditioning unit. Here are some of the most frequent problems:

  • Refrigerant Leaks: If your AC is low on refrigerant, it was either undercharged at installation or leaks. Leaks can reduce the AC’s efficiency and ability to cool the air, and they need to be fixed by a professional who will then test the repair and charge the system with the correct amount of refrigerant.
  • Faulty Wiring: Improper, haphazard, or uncertified A/C wiring is dangerous and a potential fire hazard. Faulty wiring can prevent the system from getting power or trip the circuit breaker.
  • Frozen Evaporator Coils: Your air conditioner’s evaporator coil is filled with refrigerant and absorbs heat from the air like a sponge. It may sound counterintuitive, but those coils need warm air around them to work properly. Ice can build up outside when the airflow goes wrong, and the evaporator coil gets too cold.
  • Dirty Condenser Coils: Your unit’s condenser coil, part of the outdoor unit, expels the heat removed from the air outside the building. When the condenser is dirty or covered with debris, it won’t work well, and the system has to work harder to function, leading to increased wear on the parts and even system failure.
  • Fan Problems: A malfunctioning motor, lack of lubrication, worn belts, or too much dirt and debris might cause the fan that cools indoor air and the fan that vents heat outdoors to fail.
  • Leaking Ducts: Air conditioner-cooled air circulates through your walls and ceilings via ducting. If there are breaks or leaks in the ducts, that expensive cooled air ends up inside your walls where it’s not doing any good, and your air conditioner has to work harder to cool your space.
  • Thermostat Issues: Sometimes, the problem is not with the air conditioning unit but the thermostat. A broken thermostat might cause issues in home comfort.

Addressing these issues quickly with the help of a professional can help maintain your air conditioner’s efficiency, prolong life, and conserve energy costs in check.

How do you troubleshoot AC problems?

Troubleshooting air conditioning problems involves systematic steps to identify and resolve issues affecting your AC unit. Here’s a structured approach to troubleshoot common AC problems:

  • Check the Thermostat: Set the thermostat to “cool” and lower it to room temperature. If necessary, replace the batteries for a digital thermostat.
  • Inspect Air Filters: Dirty air filters can limit airflow and reduce cooling efficiency. Check and replace filters regularly, especially if they appear dirty or blocked.
  • Inspect Circuit Breakers and Fuses: Check the electrical panel to ensure the AC unit’s circuit breaker hasn’t tripped. Reset any tripped breakers and replace blown fuses if necessary.
  • Inspect the Outdoor Unit: Clear debris such as leaves, dirt, and vegetation around the outdoor condenser unit. Provide 2 feet of space around the device for airflow.
  • Check for Ice Build-Up: Inspect the evaporator coils for ice if your AC is running but not cooling. Turn off the AC to defrost the ice, then check for low refrigerant or airflow.
  • Inspect Air Vents and Registers: Ensure none of the furniture blocks supply or return vents, curtains, or other items that could restrict airflow.
  • Listen for Unusual Noises: Pay attention to any unusual sounds from the AC unit, such as grinding, squealing, or rattling noises. These could indicate mechanical issues that require professional attention.
  • Monitor System Performance: Note any changes in cooling performance or temperature inconsistencies throughout your home. This can help pinpoint potential issues with the compressor, refrigerant levels, or ductwork.
  • Check the Condensate Drain Line: Inspect the condensate drain line for clogs or blockages preventing proper drainage. Clear any debris to prevent water backup and potential water damage.
  • Consider System Age and Maintenance History: If your AC unit is older or has a history of frequent repairs, it may be nearing the end of its lifespan. In some cases, replacement might be more cost-effective than ongoing repairs.

Contact a certified HVAC expert if these troubleshooting methods don’t work or need clarification. They can safely and effectively diagnose and repair AC issues, keeping your system running smoothly.

What causes an AC to stop working?

Several factors can cause an air conditioner to stop working or malfunction:

  • Thermostat Issues: Incorrect thermostat settings, dead batteries, or malfunctioning sensors can prevent the AC from turning on or cooling properly.
  • Electrical Problems: Tripped circuit breakers, blown fuses, or poor wiring might cut power to the AC unit, causing it to stop working.
  • Refrigerant Leaks: Low refrigerant levels due to leaks can prevent the AC from cooling effectively. Refrigerant is crucial for the cooling process, and leaks need to be repaired by a professional.
  • Frozen Evaporator Coils: Evaporator coils might freeze due to low refrigerant, restricted airflow, or other reasons preventing the AC from cooling properly.
  • Dirty or Clogged Filters: Blocked air filters restrict airflow, straining the AC and potentially overheating. This can lead to shutdowns to prevent damage.
  • Faulty Compressor: Compressors circulate refrigerant through the system. Issues with the compressor, such as electrical failures or mechanical problems, can cause the AC to stop working.
  • Fan Problems: Problems with the indoor or outdoor blower fan can prevent proper airflow, leading to inefficient cooling or system shutdowns.
  • Condensate Drain Issues: Clogged or blocked condensate drains can cause water buildup and trigger safety mechanisms that shut down the AC to prevent water damage.
  • Overload or Overheating: Continuous operation without proper maintenance or in extreme conditions can cause components to overheat or overload, leading to shutdowns.
  • Age and Wear: Older AC units or units that need to be properly maintained may experience more frequent breakdowns or failure due to wear and tear.

These issues often require professional HVAC analysis and repair to maintain your air conditioning system’s safety and correct operation. Maintenance and early repairs can prevent AC breakdowns and extend its lifespan.

Why is my AC unit leaking water?

An AC unit leaking water is a common issue that several factors can cause:

  • Clogged Condensate Drain Line: Condensate drain line clogs cause AC leaks. In AC cooling, condensation is removed by this drain line. Stuff like algae, mold, dirt, and debris clog the drain pipe, causing water to flow.
  • Frozen Evaporator Coils: Indoor unit evaporator coils freezing can cause water to overflow the drip pan instead of draining. Filthy air filters, low refrigerant, or fan difficulties sometimes hamper airflow.
  • Improper Installation: If the AC unit is not installed correctly or the condensate drain line is not properly routed, it can lead to drainage problems and water leaks.
  • Cracked or Overflowing Drip Pan: The drip pan under the evaporator coils directs condensate to the drain. However, severe condensation can break, ruin, or overflow the drip pan, leaking water from the device.
  • High Humidity Levels: AC units may produce more condensate than usual in humid conditions. If the drain line or drip pan cannot handle the volume of water, leaks can occur.
  • Dirty Air Filters: Clogged or dirty air filters restrict airflow over the evaporator coils, leading to lower temperatures and increased condensation. This can overwhelm the drip pan and cause water leaks.
  • Refrigerant Issues: Low refrigerant levels or other problems with the refrigerant system can affect the temperature and pressure inside the AC unit, potentially leading to condensation issues and water leaks.

To avoid water damage, fix leaking AC units quickly. Clean the condensate drain and drip pan. If the problem persists after basic maintenance, call an HVAC specialist for diagnosis and repair. AC maintenance and leak detection are possible.

Let’s Get Your AC Fixed Today!

Your comfort can’t wait so when something’s wrong with your AC, be sure to call the experts for prompt solutions. Our expert technicians are equipped to address common AC issues ranging from refrigerant leaks to faulty wiring and everything in between. We offer rapid diagnostics, efficient repairs, and thorough maintenance of your system to ensure a smooth operation season.

Don’t let AC troubles disrupt your comfort. Contact Horne Heating and Air Conditioning Inc. today to learn how we can provide reliable solutions and peace of mind. Stay cool with us!

AC Repair: Common Issues and How to Address Them (2024)

FAQs

What are common AC problems? ›

The compressor and fan controls can wear out, especially when the air conditioner turns on and off frequently, as is common when a system is oversized. Because corrosion of wire and terminals is also a problem in many systems, electrical connections and contacts should be checked during a professional service call.

How do I figure out what's wrong with my air conditioner? ›

10 Easy Ways to Troubleshoot Common Central AC Problems
  1. Set Your Thermostat Correctly. ...
  2. Close Your Windows and Doors. ...
  3. Investigate for Tripped Circuit Breakers. ...
  4. Clean Your Air Filters. ...
  5. Call a Technician to Check for Low Refrigerant. ...
  6. Open Your Air Vents. ...
  7. Get Your Air Ducts Cleaned. ...
  8. Investigate for Water Leaks.
Jun 10, 2024

How to fix the most common air conditioning repairs? ›

The 10 Most Common Air Conditioning Repairs
  1. Replenish Refrigerant. An air conditioner cannot work without the right amount refrigerant.
  2. Replace Capacitors. ...
  3. Clean The Coils. ...
  4. Replace or Fix Compressor. ...
  5. Replace The Condenser Fan. ...
  6. Empty The Condensation Drain. ...
  7. Repair The Defrost Control. ...
  8. Replace the Thermostat. ...
Aug 18, 2023

What is the most common thing to go out on an AC unit? ›

#1 Most Common Air Conditioning Repair – Bad Capacitor

If your thermostat seems to be working properly, air is blowing from your vents but it's just not cold, find your outside unit (condenser) and see if it's working.

What is the average life expectancy of a AC? ›

Central air conditioning systems can last anywhere between 10 to 30 years, with most averaging around 10 to 15 years total (1). Keep in mind, the lifespan of your air conditioner depends on how much you use it, your local climate, what type of AC it is, and if your house is well insulated and air sealed.

What fails the most in an AC unit? ›

Frozen Coil

This is one of the most common air conditioner problems. There are many reasons that could cause a frozen coil. The reasons could range from low refrigerant levels to mechanical failures.

Why is my AC running but not cooling? ›

There are a number of reasons why your air conditioner might be running but not cooling. It could be an issue with the thermostat, the compressor, or the evaporator coils. Or, it could simply be clogged with dust and debris, which is preventing it from working properly.

How do I troubleshoot my AC problems? ›

Check these issues when the unit won't kick on:
  1. Check the thermostat and adjust the settings if it isn't set to Cool and an appropriate temperature setting to call for cooling.
  2. Examine the house circuit breakers for the AC unit and reset any tripped breakers.
  3. Check the air filter and replace the filter if it's dirty.
Mar 8, 2024

Why is my AC not blowing cold air? ›

First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.

What typically breaks on AC? ›

Clogged Air Filter

This is one of the most common reasons for AC breakage. If you don't change the filters regularly, the debris on the filter will restrict the airflow, making the system work harder and having the components wear out faster.

How much does a capacitor cost for an air conditioner? ›

Capacitors are fairly sturdy, but they do burn out over time. Luckily, this is an inexpensive air conditioner part to replace. The capacitor itself costs an average of $8–$45, but the overall price to have it replaced ranges from $80–$400.

At what temperature does AC stop working? ›

Most air conditioning systems are designed to function with outside temperatures of 100 degrees or less. When temps reach above 100, expect lower AC performance and potential breakdowns.

What is the most expensive part of an AC unit to replace? ›

The most expensive part of an AC unit to replace and repair is the air compressor.

How do I know what's wrong with my AC unit? ›

10 Signs Your Air Conditioner Needs Repair or Replacement
  1. Air Conditioning System is Blowing Warm Air. ...
  2. AC Thermostat is Not Working. ...
  3. Little Air Blows Out of Vents. ...
  4. Loud Noise Inside of the AC Unit. ...
  5. Strange Odors When AC Turned On. ...
  6. Not Enough Humidity Removed By the AC. ...
  7. Problems with the AC Are Occurring More Often.

How do you identify a fault developed in an AC? ›

Consequently, the faults in the AC system shall be detected based on other measurements that are realized today for other usage in the buildings, such as the power conception, the inside/outside temperature/humidity, and the total heat load.

Why is my AC not cooling? ›

One of the most common culprits behind reduced cooling capacity is a dirty air filter. A clogged filter restricts airflow, impairing the AC's ability to pull in warm air and release cool air. Making sure to clean the filter at regular intervals is essential for optimal performance.

How do you know if your AC needs to be replaced? ›

If your air conditioner has stopped working or keeps running without cooling your home, those are two clear signs your air conditioner needs to be replaced. The cause of overheating may be a mechanical failure or insufficient coolant levels in the evaporator. Either way, it will need repairs to function properly again.

References

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