In a home with central air conditioning, unrestricted airflow is essential. If rooms are closed off, that’s when the problems occur.

Various problems can affect air conditioning systems, from poor installation to improper maintenance. Incorrect installation can result in leaky ducts and low airflow. Gaps around and between the return-air grille, supply-air grille, diffuser, and wall registers allow conditioned air to leak into unconditioned spaces. 

Common Problems of an Airconditioning Unit

Below are the common problems you will encounter with an AC unit.


1. Insufficient Maintenance


Unclean filters and air conditioner coils make the air conditioner work improperly, and the air conditioner is likely to break down sooner.


2. Low on Refrigerant 


The system has low pressure if your air conditioner continually cycles on and off and the temperature is not constant. Simply adding refrigerant won’t resolve this issue. You should have a trained technician inspect the system for leaks and then add the appropriate amount of refrigerants. 


3. Wiring Issues 


The compressor and fan controls in an air conditioning system can wear out over time, especially when it frequently turns on and off. This is common in systems that are oversized for the house. Wire and terminal corrosion is also a common problem in many systems. You should let a professional technician check electrical connections and contacts frequently.


4. Drainage Problems


When it’s humid outside, check the condensate drain to ensure it is clear and working properly. Room air conditioners should be mounted level to avoid drainage issues.


5. Making Noises


Different sounds are associated with different problems with air conditioners, the most common of which is a refrigerant leak. During a leak, you can hear the hissing sound of escaping gas.

On the other hand, it might be a relay problem if you hear clicking sounds when you turn your air conditioner on and off. A relay is a switch that turns AC circuits on and off. Meanwhile, when  you hear thumping, rattling, or banging sounds, it might be a problem with the AC blower or motor assembly.

Lastly, if your electrical components are making buzzing sounds, it might be faulty wiring.


6. Thermostat Batteries


Your AC won’t turn on if the thermostat batteries are dead. You need to replace the batteries as soon as you can. Before you change them, check the thermostat settings and confirm that the cooling mode is on with your desired temperature settings. 

Next, check the circuit breaker to ensure it isn’t tripped. If it has tripped, flip the switch off and then on to reset the circuit breaker. Once you flip it on, your AC should turn on.


Air conditioners are generally durable and can last at least a decade. If your unit fails, check out this article; you may find the possible issues and gear you towards the solution.

If you cannot identify the issue and the solution, then it’s best to leave it to the professionals. Contact 4 Seasons Home Comfort for air conditioning repair in Lethbridge. We have been servicing Southern Alberta for 40 years. Request a quote today!