Common Air Conditioning Problems and How to Fix Them

Symptoms: The air conditioner is running, but it doesn’t cool your home as it should.

DIY Solution:

• Check and replace dirty or clogged air filters.
• Clean debris around the outdoor unit and ensure proper airflow.
• Verify that your thermostat is set to the correct temperature and mode (cooling).
• Ensure windows and doors are closed tightly to prevent warm air from entering.

Symptoms: The air conditioner is running, but it’s blowing warm or room-temperature air.

DIY Solution:

• Double-check that your thermostat is set to cooling mode.
• Inspect for ice on the evaporator coils; if present, turn off the AC and let the ice melt.
• Clean or replace dirty air filters.
• If the problem persists, it may be due to a refrigerant issue or a malfunctioning compressor, which requires professional assistance.

Symptoms: Your air conditioner doesn’t start when you adjust the thermostat.

DIY Solution:

• Make sure the thermostat’s batteries are functioning and replace them if needed.
• Check the circuit breaker or fuse box to ensure the AC circuit is not tripped.
• Examine the condensate drain pan for clogs; if it’s overflowing, the safety switch may prevent the AC from running.

Symptoms: Your AC unit produces unusual or loud noises, like banging, hissing, or clanking.

DIY Solution:

• Rattling sounds could be due to loose screws or parts; tighten them.
• Hissing may indicate a refrigerant leak; contact a professional immediately.
• If you hear clicking sounds, the issue could be a failing capacitor, which requires professional repair.

Symptoms: Some rooms in your home are cooler than others.

DIY Solution:

• Ensure all vents are open and unobstructed.
• Check for leaks in the ductwork, sealing them to prevent conditioned air from escaping.
• If the problem persists, consider upgrading to inverter mini-split systems for zone cooling and improved efficiency.

Symptoms: Ice forms on the AC’s indoor or outdoor unit.

DIY Solution:

• Turn off the AC to let the ice melt.
• Inspect and clean dirty or clogged air filters.
• Make sure there are no obstructions around the unit that restrict airflow.
• If freezing continues, there may be a refrigerant issue, so contact a professional.

Symptoms: You notice water pooling around the indoor unit.

DIY Solution:

• Check the condensate drain line for clogs or blockages and clear them if present.
• Inspect the condensate drain pan for cracks or damage and replace it if necessary.
• If you can’t identify the source of the leak, seek professional help to prevent water damage.

Symptoms: Unpleasant odors are emitted from the AC.

DIY Solution:

• Change or clean dirty air filters.
• If the odor persists, it may be mold or mildew growth in the ducts. Consider professional duct cleaning.