Why Your AC Unit Isn’t Working: Common Causes and Solutions


The scorching summer heat can make it unbearable to stay indoors without an air conditioning (AC) unit. However, it can be frustrating when your AC unit suddenly stops working or fails to cool your home. 

This article will discuss why your AC unit isn’t working and provide several solutions to help you troubleshoot and fix the problem.

1. Dirty Air Filter

A clogged air filter may cause your AC unit to malfunction. The air filter catches dirt, dust, and debris that may accumulate over time and restrict airflow. When the air filter is dirty, it reduces the AC unit’s efficiency and causes it to overheat or shut down.

Have your air filter checked regularly and replaced every 1-3 months, depending on usage. You can also clean the air filter if it is reusable.

2. Thermostat Malfunction

Sometimes, your AC unit may not be working because of a faulty thermostat. It regulates the temperature within your house and sends signals to the AC unit to turn on or off. If the thermostat doesn’t function like it used to, your AC unit may also malfunction.

Tweak the thermostat settings and make sure that it is set to cool. A thermostat that isn’t working correctly warrants a prompt replacement. 

3. Refrigerant Leaks

Refrigerant is the substance that keeps the air in your AC unit cool. If it’s running low on refrigerant or has a refrigerant leak, it can cause the unit to stop cooling. A refrigerant leak can also be harmful to the environment and cause health problems.

Should you suspect a refrigerant leak, call an HVAC technician to inspect and repair the unit. Don’t try to fix the leak yourself; it can be dangerous.

4. Dirty Condenser Coils

The purpose of condenser coils is to release the heat absorbed from the air in your home. If the condenser coils are clogged or grimy, the AC unit to overheat or stop working.

Clean the condenser coils regularly to remove dirt and debris. You may use a soft brush or a vacuum cleaner to clean the coils.

5. Electrical Problems

Electrical problems can also cause your AC unit to malfunction. An issue or problem with the wiring or circuit breaker may result in a malfunctioning unit or tripping the breaker.

On your end, examine the circuit breaker and make sure that it is not tripped. Hire an electrician to inspect and repair the writing if it’s damaged.

In Summary

There are numerous reasons why your AC unit isn’t working, including a dirty air filter, thermostat malfunction, refrigerant leaks, dirty condenser coils, and electrical problems. Regular maintenance and cleaning can help prevent some of these issues; if you suspect a refrigerant leak or electrical problem, turn to an HVAC technician. By troubleshooting and fixing the problem as soon as possible, you can be sure that your AC unit works efficiently and keeps your home cool and comfortable during the hot summer months.

At Lennox Dealers Toronto, we proudly offer air conditioner repairs and maintenance in Toronto, ON, and surrounding areas. Our experienced technicians can identify and resolve any AC unit issues, ensuring it operates smoothly and efficiently. Keep your home cool all year by calling us today at 1-855-241-7171. You may also schedule an appointment or request a free estimate anytime. We look forward to serving you!

Call Us Now For A Free Estimate 1-855-241-7171