Many common AC problems can be diagnosed and fixed without professional help. Here's a guide to troubleshooting issues that homeowners can safely address.
AC Not Turning On
Check First:
- Power supply: Check circuit breaker and wall socket
- Remote batteries: Replace if weak
- Timer settings: Make sure timer isn't preventing operation
If Still Not Working:
Check for error codes on display. Indoor unit capacitor failure is common and replaceable.
AC Not Cooling
Check First:
- Dirty filter: Clean or replace monthly
- Blocked airflow: Ensure vents aren't blocked
- Thermostat setting: Set below room temperature
- Outdoor unit: Clear debris around condenser
Signs of Bigger Problems:
- Ice on pipes = possible refrigerant leak (call tech)
- Outdoor unit not running = compressor or electrical issue
Strange Noises
- Clicking: Normal at startup; continuous = control issue
- Buzzing: Loose parts or electrical problem
- Rattling: Loose screws, panels, or debris
- Squealing: Belt or motor bearing (call tech)
- Gurgling: Refrigerant issue or drain problem
Water Leaking
Indoor Unit Dripping:
- Clogged drain line (flush with water/diluted bleach)
- Frozen evaporator coil (dirty filter or low refrigerant)
- Improper installation (unit not level)
When to Call a Professional
Call a technician for:
- Refrigerant issues
- Electrical problems beyond the basics
- Compressor failure
- Anything requiring opening sealed refrigerant system
DIY Repair Resources
Use our DIY Repair Guide for step-by-step instructions, and our Error Code Lookup to decode what your AC is telling you.