12 Most Common Air-Conditioning Problems


Air conditioners are a necessity, especially if you live in hot regions, or if the summer heat is too intense. Surviving the intense summer heat can be a bad experience if your air-conditioning system decides to cause problems during a period of intense heat.

There are lots of people whose air conditioners give up on them midsummer. This can happen even if the air conditioner doesn’t show any faulty sign. Air conditioners are designed to be long-lasting, dependable, and durable.

Even with the warranty from the manufacturers, the system can pack up at any time, and this problem can be caused by a lot of factors. This article will be highlighting 12 major air-conditioning problems, and how you can easily resolve them.

12 Air Conditioning Problems And How To Resolve Them

  1. Faulty Wiring:

Faulty Wiring Check Up

If the wiring of your AC unit isn’t done properly especially at the time of the system installation, then it may prevent the air-conditioning system from getting full power. A bad, haphazard air conditioner wiring is risky, and can cause a possible fire outbreak.

Bad wiring prevents the unit from getting the full power it needs for efficient operation, and can also trip the circuit breaker. Faulty wiring can also lead to the corrosion of sensitive terminals and wires, which leads to fire outbreak, sometimes it may cause heating problems and need to check the heating repair by the professionals.

You should always carry out an inspection of your air conditioner wiring system, if you smell wire burning or see occasional sparks, and then it is advisable to turn off your unit, and call a professional to check it out.

  1. Refrigerant Leaks:

Refrigerant Leaks

Refrigerant leaks are one of the most common problems in a faulty air-conditioning system. When the refrigerator coolant starts to leak, the air conditioner will not perform effectively, and the temperature will always fluctuate.

The refrigerant is the part of the air conditioner that makes it an air conditioner. Refrigerant leaks can be caused by a lot of factors.

  • Formic acid can start to eat away the copper pipes and cause refrigerants to leak.
  • Basic wear and tear of the unit components, especially if it has stayed for some time.
  • A strong vibration or shock can weaken the seals between the pipes and damage the pipe itself.
  • A refrigerant leak can happen if the air conditioner is undercharged during installation.

Sometimes low refrigerants can be caused by human error and not necessarily a leak. The performance of your air conditioner is at the optimum best if the refrigerant charge fits the specification of the unit manufacturer.

Refrigerant leaks are harmful to the environment. Anytime you suspect a refrigerant leak it is advisable to call in a professional to have your unit checked out.

  1. Drainage Problems:

Drainage Problems

Another major problem that can lead to a faulty air-conditioning system are drainage problems. When the weather is humid outside, it is better you inspect the condensate drain to make sure it is working properly.

A clogged drain can lead to a lot of problems that will eventually damage the air conditioner. Room air conditioners can also face drainage problems of they are not mounted properly.

  1. Electric Control Issues:

Air Conditioning Problems

Electrical connections and contacts are usually affected by an air-conditioning system. The compressor and fan tend to wear out, especially when the system turns on and off often. By virtue of that, a chance of heating repair occurs to prevent from any other cause.

Maintaining the electrical control of your cooling system is important to stop your AC from developing a fault.

  1. Outside Fan Not Working:

Outside Fan Not Working

The job of the outside fan is to convey hot air or heat from your home to the outside air. If the outside fan is not performing at its best, then heat will not be conveyed properly from your home outside.

This may cause the air conditioning compressor to overheat and even trip the safety overload. It can even cause internal damage to the compressor.

  1. Frozen Coil:

Frozen Coil

This is a problem encountered by most air-conditioning system. A frozen coil is caused by the block in airflow which is a direct result of dirty air filters. Frozen indoor coils are also caused by low refrigerants in the air-conditioning system.

To eliminate this problem, make sure you clean your air filters regularly, and always check if your refrigerant is filled to the manufacturer specification.

  1. Sensor Problems:

Sensor Problems

Every room air conditioner has an inbuilt thermostat sensor which measures the amount of air passing through the evaporative coil. The thermostat sensor is located near the control panel, and if knocked out of position can make the air conditioner to start working inefficiently.

To make sure the sensor is working perfectly make sure it doesn’t touch the coil, just near it. You can adjust the wire by carefully bending and placing the wire that holds the thermostat in place.

  1. Compressor Problems:


The compressor helps carry out heat exchange by applying energy on the refrigerant and passing it through the coil. If the compressor, however, is not working then the air-conditioning system will not cool your home.

If there is not enough refrigerant then the compressor will run too hot, and eventually pack up. If there is too much refrigerant then some of it can return into the compressor and cause it to stop working.

  1. Condenser Coil:

Condenser Coil

The condenser coils are located outside the compressor, so there is a high possibility of it getting dirty due to the elements. They can usually be cleaned with a water hose, but if they get too dirty for a water hose, a professional can clean them with a specific chemical agent.

  1. Evaporator Coils:

Evaporator Coils

The job of the evaporator coil is to absorb heat in the air, pass it through some cooling ducts, and pass it inside your home as cool air. These coils can become corroded over the years and will require proper maintenance to keep it working at its optimum.

  1. Capacitors:


Without the air-conditioning system capacitor, the compressor and fans won’t work. There are two types of capacitors, the start capacitor, and the run capacitor. The start capacitor activates the motor, while the run capacitor keeps the motor running.

  1. Breakers And Fuses:

Breakers And Fuses

The breakers and fuses help safeguard the compressor and motors from overheating. When the motor or compressor dies the first thing the repairman checks is the breaker.

Air conditioning system is still not working, get a professional to do the job. Contact Apex Air Conditioning Sydney, the Commercial Air Conditioning Experts You Can Count On!


  1. I’m glad you mentioned that professionals have a special chemical agent to clean the condenser coils of an AC unit more effectively than we can. My husband and I just bought a fixer-upper house in our neighborhood, and we want to have the air conditioning inspected and upgraded by a professional as part of the repairs. Thanks for giving me a better idea of the different services that professional HVAC services can provide! https://lakesideheating.com/ac-repair/


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