Common AC Problems

Air conditioners are designed with one purpose: to provide comfortable, cool, dry air during the hot summer months. So when they occasionally run into issues, their whole performance is disrupted. Before you panic and call a professional, there are several troubleshooting steps you can take to address common AC problems. Some of which you may even be able to fix yourself! 

In this guide, the Dows ClimateCare team covers the most frequent issues and practical solutions you can try at home. 

Why Is My Air Conditioner Not Cooling Properly? 

If your air conditioner isn’t cooling properly, several factors could be responsible. Start by checking the thermostat settings to ensure it’s set to “cool”, and the temperature is set lower than the room temperature. Next, inspect the air filter. A clogged or dirty filter can restrict airflow, making it harder for your AC to cool your home. Replacing the filter every 1-3 months can prevent this issue. Additionally, check for any obstructions around the outdoor unit that might be blocking airflow. Clearing debris and ensuring adequate ventilation can often restore cooling efficiency. 

What Should I Do If My AC Is Not Turning On? 

When your AC doesn’t turn on, the first step is to check the power supply. Ensure the unit is plugged in and the circuit breaker hasn’t tripped. If the breaker has tripped, reset it and see if the AC starts. Also, inspect the thermostat to make sure it’s functioning correctly and has fresh batteries. If these steps don’t resolve the issue, it could be a sign of a more complex problem requiring professional attention. 

Why Is My Air Conditioner Making Strange Noises? 

Strange noises from your AC unit can indicate several issues. Rattling sounds might suggest loose parts, while a grinding noise could indicate a problem with the motor. If you hear hissing, it might be a refrigerant leak. Start by turning off the unit and inspecting for any loose screws or components that can be tightened. If the noise persists, it’s best to call a professional to avoid further damage. 

What Can Cause My AC to Leak Water? 

Water leakage from your air conditioner is often due to a clogged condensate drain line. Over time, dirt and debris can block the line, causing water to back up and leak out of the unit. You can try unclogging the line with a wet/dry vacuum or a pipe cleaner. Another common cause is a dirty air filter, which can cause the evaporator coils to freeze and then leak water when they melt. Regularly replacing the air filter can prevent this issue. 

Why Is My AC Blowing Warm Air? 

If your AC is blowing warm air, it could be due to several reasons. First, check the thermostat settings to ensure it’s set to “cool.” Next, inspect the air filter for dirt and debris that could be restricting airflow. Also, check the outdoor unit to ensure it’s not blocked by leaves or other debris. Another possibility is low refrigerant levels, which will require a professional to check and refill. 

What Should I Do If My AC Is Short Cycling? 

Short cycling, where the AC turns on and off frequently, can be caused by various factors. Start by checking the air filter and replacing it if it’s dirty. Ensure the thermostat is positioned away from heat sources that might cause it to misread the temperature. Also, inspect the outdoor unit for obstructions that could be affecting airflow. If short cycling continues, it may indicate a more serious issue with the compressor or refrigerant levels, necessitating professional service. 

How Can I Improve the Efficiency of My Air Conditioner? 

Improving the efficiency of your air conditioner can reduce energy costs and prolong the unit’s lifespan. Regularly replacing air filters and scheduling annual maintenance checks are essential. Ensure the outdoor unit is clear of debris and has adequate ventilation. Additionally, using a programmable thermostat to regulate temperature settings can optimize efficiency. Sealing windows and doors to prevent cool air from escaping also helps maintain a consistent indoor temperature. 

What Are the Signs of a Refrigerant Leak? 

Refrigerant leaks can severely impact your AC’s performance. Signs include a decrease in cooling efficiency, hissing noises from the unit, and ice forming on the evaporator coils. If you suspect a refrigerant leak, it’s important to contact a professional immediately. Handling refrigerant requires specialized training and equipment, and a certified technician can safely locate and repair the leak. 

Why Does My AC Smell Bad? 

Bad odours from your AC unit can result from various issues. A musty smell often indicates mould or mildew growth within the unit or ducts, typically caused by moisture buildup. Check and clean the air filter and ensure the condensate drain line is clear. A burning smell could signal an electrical issue, in which case you should turn off the unit and call a professional immediately. Regular cleaning and maintenance can prevent unpleasant odours. 

How Often Should I Replace My AC’s Air Filter? 

Replacing your AC’s air filter is crucial for maintaining efficiency and air quality. Generally, it’s recommended to replace the filter every 1-3 months, depending on usage and environmental factors. Homes with pets or occupants with allergies may require more frequent replacements. Regularly replacing the filter prevents airflow restrictions, reduces strain on the system, and ensures cleaner air circulation. 

What Can I Do If My AC’s Coils Are Frozen? 

Frozen coils usually indicate an airflow issue or low refrigerant levels. Start by turning off the AC to allow the coils to thaw. Check and replace the air filter if it’s dirty. Ensure that the vents and registers are open and unobstructed. If the coils continue to freeze, it may suggest low refrigerant levels or a more complex issue requiring professional inspection and repair. 

How Can I Prevent Common AC Problems? 

Preventing common AC problems involves regular maintenance and timely inspections. Replace air filters every 1-3 months, keep the outdoor unit clear of debris, and schedule annual professional maintenance checks. Ensure your thermostat is functioning correctly and placed away from heat sources. Regularly clean the condensate drain line and check for any signs of wear or damage. Proactive maintenance can help identify and address potential issues before they become major problems. 

So, When Should I Call a Professional for AC Repairs? 

While some AC issues can be resolved with basic troubleshooting, certain signs and symptoms indicate the need for professional intervention. Here are key indicators that you should call a professional technician: 

  • Persistent Noises: Unusual sounds like grinding, banging, or screeching suggest mechanical issues that require expert attention. 
  • Frequent Cycling: If your AC turns on and off frequently, it could be a sign of a malfunctioning thermostat, compressor issues, or improper system sizing. 
  • Weak Airflow: Significantly reduced airflow through the vents may indicate a problem with the compressor or ductwork, both of which need professional inspection. 
  • Warm Air: If your AC is blowing warm air despite correct thermostat settings, it could be due to low refrigerant levels or a failing compressor. 
  • Water Leaks: Any sign of water pooling around your AC unit often points to a clogged condensate drain or a refrigerant leak. 
  • Bad Odors: Foul smells, such as burning or mustiness, can indicate electrical issues or mould growth, both requiring professional handling. 
  • High Humidity: If your AC is not effectively removing humidity, it might be a sign of a malfunctioning system. 
  • Inconsistent Cooling: Uneven cooling in different areas of your home suggests potential ductwork issues or system inefficiencies. 
  • High Energy Bills: A sudden increase in energy bills can be a sign that your AC is working harder than necessary due to underlying problems. 
  • System Won’t Turn On: If your AC doesn’t turn on after checking the power supply and thermostat, professional diagnosis is needed. 

If you notice any of these issues, it’s best to call a trusted HVAC professional to ensure safe and effective repairs. 

Dows ClimateCare, At Your Service  

By understanding common AC problems and taking proactive steps, you can often resolve minor issues without professional help. However, for more complex problems, it’s crucial to contact a trusted HVAC professional. At Dows ClimateCare, our experienced technicians are ready to assist with all your air conditioning needs, ensuring your home stays cool and comfortable. Contact us today to book expert service and maintenance. 

For additional tips and helpful advice, join our mailing list by signing up using your email below. We only send out quarterly updates to homeowners who like staying in the loop!

Sign up to receive helpful home comfort tips and reminders
  • This field is for validation purposes and should be left unchanged.