Lack of maintenance. A rooftop unit requires regular maintenance to keep it running smoothly. If it hasn't been properly maintained, you might find yourself searching for the information on the Internet ‘Rooftop AC unit doesn’t work’.

Dirty air filters. Air filters in the rooftop unit can become clogged with dirt and debris, reducing airflow and causing the unit to work harder. This can lead to malfunctions and an urgent call for AC repair.

Electrical issues. Faulty electrical connections, wiring issues, or blown fuses are most likely to be the reason for a call for an AC unit repair or even replacement.

Refrigerant leaks. Leaks in the refrigerant lines can cause the rooftop unit to stop cooling properly and require AC repair.

Wear and tear. Like any mechanical equipment, a rooftop unit is subjected to wear and tear over time. In this case, do not wait until your rooftop AC unit doesn’t freeze or turn on at all, call a professional for AC maintenance in time.