To troubleshoot AC problems, start by checking the power supply, circuit breakers, and thermostat settings. Inspect and clean air filters regularly to ensure proper airflow. Examine condenser and evaporator coils for dirt or ice buildup, and check vents and ducts for blockages. Low refrigerant or unusual noises may indicate mechanical issues requiring professional attention. Clear the condensate drain to prevent leaks or shutdowns. For digital units, review any error codes displayed. If problems persist, or if you suspect electrical faults, refrigerant leaks, or compressor issues, contact a certified AC technician for safe and reliable repairs.