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Keep Your Cool: Easy Ways to Troubleshoot Common AC Problems

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Summer is the time for relaxation, outdoor activities, and vacations. However, when temperatures soar, the air conditioning (AC) unit becomes the most crucial appliance in your home. Unfortunately, AC problems can occur, and if not addressed promptly, they can ruin your summer. This article will discuss five common AC problems and the easy ways to troubleshoot them.

1. The Unit Won’t Turn On

When the AC unit fails to turn on, the first thing to check is the thermostat. Ensure it is set to the desired temperature and in cooling mode. If the thermostat is working correctly, check the circuit breaker. If the breaker has tripped, reset it. However, if it trips again, there may be a more significant problem, and you need to call an HVAC technician.

2. Weak Airflow

Weak airflow is a common AC problem that various factors can cause. The first thing to do is check the air filter. A dirty or clogged air filter restricts airflow, making your AC unit work harder and longer, resulting in higher energy bills. Replace the air filter if it is dirty or clogged. Another cause of weak airflow is a clogged condenser coil. The condenser coil is responsible for releasing heat outside. If it is clogged with dirt and debris, it can’t release heat efficiently, resulting in weak airflow. Clean the condenser coil regularly to prevent this problem.

3. Leaking Water

If you notice water leaking from your AC unit, it could be due to a clogged condensate drain line. The condensate drain line removes moisture from the air conditioning system. Over time, it can become clogged with dirt and debris, causing water to overflow the drain pan and leak from the unit. To fix this problem, locate the drain line and use a wet/dry vacuum to clear the blockage. Alternatively, you can use a pipe cleaner or a long, flexible brush to clean the drain line.

4. Strange Noises

Strange noises coming from your AC unit can be annoying and a sign of a more significant problem. A rattling noise could be due to loose parts, such as screws, bolts, or fan blades. A screeching noise may indicate a worn-out belt or motor bearings. A banging noise could be due to a faulty compressor or blower motor. If you notice any strange noises, turn off the AC unit and call an HVAC technician to diagnose and fix the problem.

5. Foul Smells

Foul smells coming from your AC unit are unpleasant and a sign of a potential health hazard. The most common cause of foul smells is microbial growth, such as mould and mildew, in the air conditioning system. Microbial growth can cause respiratory problems and allergies. To prevent microbial growth, clean the air filter regularly and keep the humidity level low. If you notice foul smells, turn off the AC unit and call an HVAC technician to clean and disinfect the system.


AC problems can be frustrating and ruin your summer. However, you can prevent or fix the most common AC problems with the right troubleshooting techniques. Remember to check the thermostat, air filter, and condenser coil for weak airflow, clogged condensate drain line for leaking water, loose parts, worn-out belts or motor bearings, and microbial growth for foul smells. If you are unsure or uncomfortable troubleshooting your AC unit, call an HVAC technician to diagnose and fix the problem. With a well-maintained AC unit, you can keep cool and enjoy your summer to the fullest. 

Furnace King Home Services has been a reputable heating and cooling company for 43 years. Our team of experts will assess your heating and cooling needs and recommend a system within your budget. We offer reliable AC maintenance in Mississauga to ensure a cool and comfortable summer. Contact us today to schedule an appointment at 905.564.5464.