1. Banging or Clanking

• Possible Cause: Loose or broken parts in the blower assembly or compressor.
• Fix: Turn off the system and inspect for loose screws, bolts, or damaged components.

2. Buzzing or Humming

• Possible Cause: Electrical issues, such as a failing capacitor or contactor.
• Fix: Call an HVAC technician to inspect the electrical components.

3. Rattling

• Possible Cause: Loose panels, debris in the system, or failing motor bearings.
• Fix: Tighten panels, remove debris, and lubricate bearings if necessary.

4. Whistling or Screeching

• Possible Cause: Airflow restrictions, worn belts, or motor issues.
• Fix: Replace air filters, check for duct blockages, and inspect the blower motor belt.

5. Hissing

• Possible Cause: Refrigerant leaks or duct leaks.
• Fix: If refrigerant is leaking, contact a professional immediately.

6. Clicking

• Possible Cause: Relay or capacitor failure.
• Fix: If clicking occurs continuously, have an HVAC expert inspect the system.