What are typical problems my HVAC system may have?

While today’s HVAC systems are built to deliver years of dependable service, inevitably problems with air conditioning ranging from the simple to the complex can and will arise. Here are several of the most common issues reported by homeowners and their HVAC service professionals:

Dirty Air Filters

Air filters should be changed regularly. Otherwise airflow can be reduced significantly, which can cause your HVAC system to underperform and eventually freeze.

Clogged Drain Lines

A common problem caused by dirt and other organic materials building up in the lines, this can cause water to back up in and ultimately overflow the drain pan—potentially damaging system components.

Blown Fuses

If your HVAC system isn’t working, a breaker could have flipped off. Fuses are designed to protect your unit’s motor and compressor from overheating. A blown fuse may be a sign of a larger problem with your system.

Low Refrigerant

Whether in the lines or in the coils, refrigerant leaks are often caused by system vibration during operation. If your system’s refrigerant requires recharging, you have a leak that requires repair.

Dirty Condenser Coils

Located outside the home and exposed to the elements, condenser coils should be cleaned yearly. Failure to do so can negatively impact system performance.

Electrical Problems

Faulty wiring or worn contactors can be the cause of system outages and should be checked periodically.

Frozen Evaporator Coil

Obstructed air returns or clogged air filters can restrict airflow and cause the evaporator coil inside your home to freeze up. Low refrigerant level can also cause this problem.


These control devices can stop working and require replacement. You can also inadvertently turn them off or not have them on the correct setting for the season or your indoor comfort preference.