Common HVAC Issues That Can Be Diagnosed the DIY Way

You rely on your HVAC system to create a cool environment during the hot summer days and warm climate during chilly winter nights. No one wants to deal with a stuffy home when the heat or cold sets in. While a faulty HVAC system may command to tap a professional, many common HVAC issues can be diagnosed the DIY way.


Before you try to diagnose any issues in your HVAC unit, first off, you need to check and make sure that the thermostat is turned on and properly set. Your HVAC system is controlled by thermostat, so if it’s not in good shape, then your air conditioner is likely not, too.

Poor HVAC maintenance

One of the most common causes of system malfunction or breakdown is poor HVAC maintenance. As a smart homeowner, you should consider necessary maintenance, such as changing your air filters in a monthly basis. In addition, you must tap a local HVAC contractor for a professional service check at least once a year to ensure that your system is in tip top shape.


If your air conditioner is blowing air, but you still feel hot, it is likely that there is an issue on the refrigerant. It may have a leak or low on refrigerant. A common coolant or refrigerant is Freon. If your AC units were manufactured before 2010, and it is low on coolant or has a leak, it may still qualify for more Freon. One caveat: only licensed HVAC technicians should purchase Freon and it’s not a good idea to recharge an air conditioner the DIY way.

Drainage block

The drainage line can be clogged by debris and specs of dirt over time. Other drainage clogs can also arise from the formation of mold, mildew or algae. In cases like these, a half-gallon of vinegar can do the trick to remove these unwanted particles. A clogged drainage line can take a great toll from the efficiency of your HVAC system.

Electrical Failures

Turning your HVAC systems on and off frequently can increase the chance of electrical failures. AC units have three components: condenser, blower motor, and compressor. These components allow or disable the functions of your unit when turned on or off. Frequent switch on-and-off of your HVAC systems can lead to early wear and tear of your unit. Tap a professional technician to prevent electrical failures.

Sensor Malfunction

Thermostats utilize sensors situated behind the control panel to measure air temperatures drawn out of the evaporator coil. These sensors can be easily damaged, which may lead to HVAC malfunctioning or breakdown. To check your sensor, just open the panel and check the placement of the sensor. If the sensor gets in contact with the evaporator coil, adjust the wire slowly.