Depending on whether or not you have a central air conditioning system or a mini-split system, your initial trouble shooting will be different. Let’s look at the most popular HVAC units.
Central Air Unit
A clogged filter restricts airflow through the unit decreasing its efficiency and reducing the ability to effectively cool the air. If you haven’t cleaned the filter in your air conditioner recently, do it now. Filters on central AC units should be changed at least once a month, especially if your system is running constantly or you have pets.
Check the window seals around your unit to make sure hot air isn’t getting in or cold air seeping out. If so, reseal around your unit with pieces of weatherstripping.
An inspection by an HVAC technician can catch any serious problems before they get worse and leave you hot and bothered at the peak of summer. The technician will check all the moving parts as well as the refrigerant and recharge the system if necessary.
The first step in resetting your unit is to unplug it from the electrical outlet. Count to twelve and plug the unit back in. Now, locate the reset button. It should be in a visible spot, but the button may be tiny. Press it, and see if your air conditioner starts working. Try pressing the reset button once more if your unit fails to start. If you still don’t get any reaction, your next step is to flip the main circuit breaker that powers your home, and cross your fingers that it works.
Keep your air conditioner plugged in and locate the electrical panel for your house. Find the circuit breaker that controls the electrical outlet you’ve plugged your air conditioning unit into, and turn it off. Wait five minutes. Turn the circuit breaker back on and see if your air conditioner is blowing cool air. If it isn’t, try once more to reset the unit. Chances are good that this will solve your problem and get your home back to normal.
Ductless Air Mini-Split System
Start your ductless AC troubleshooting by checking the air filter. It should be washed at least every month. Also check to see if there is any ice buildup on the coil.
If there is ice build up, check to make sure the fan is working. Make sure the blower wheel is free to move. If it is free and the fan is not working then the problem is probably the motor or the control board. If the fan is working, allow the ice to melt and check the refrigerant level in the unit.
If all of the above are working, follow the same steps for the central air unit troubleshooting and unplug your unit, and reset it.