POSSIBLE CAUSES

Of The Most Common HVAC Problems

The information below is provided as a general guide to help you better understand common HVAC issues. While some problems may seem simple, diagnosing and repairing an HVAC system requires the expertise of a licensed and certified technician. For your safety and to avoid further damage, we strongly recommend having all repairs and maintenance performed by a qualified professional.

1. AC Not Cooling Properly

Possible Causes:

  • Dirty air filter

  • Low refrigerant levels (possible leak)

  • Thermostat set incorrectly

  • Blocked or closed vents

  • Failing compressor

2. System Not Turning On

Possible Causes:

  • Tripped breaker or blown fuse

  • Faulty thermostat

  • Clogged drain pan causing system to shut down

  • Blown capacitor or control board issue

3. Uneven Cooling or Hot Spots

Possible Causes:

  • Poor duct design or leakage

  • Closed or blocked vents

  • Failing blower motor

  • Incorrect thermostat location

4. Strange Noises (Buzzing, Banging, Clicking)

Possible Causes:

  • Loose parts or debris in the unit

  • Failing motor or fan

  • Compressor issues

  • Electrical problems

5. High Utility Bills

Possible Causes:

  • Dirty filters or coils making system work harder

  • Low refrigerant

  • Poor insulation or duct leaks

  • Old, inefficient unit

6. Water Leaks Around the Unit

Possible Causes:

  • Clogged or disconnected drain line

  • Frozen evaporator coil

  • Dirty filter restricting airflow

  • Improper installation

7. AC Blowing Warm Air

Possible Causes:

  • Thermostat set to “heat” or fan only

  • Low refrigerant (leak)

  • Dirty outdoor condenser coil

  • Compressor or capacitor failure

8. Short Cycling (Turns On and Off Too Frequently)

Possible Causes:

  • Oversized unit

  • Dirty air filter

  • Thermostat malfunction

  • Refrigerant issue

9. Unpleasant Odors

Possible Causes:

  • Mold in ducts or evaporator coil

  • Clogged drain line causing stagnant water

  • Burnt-out motor or wiring

10. Frozen Evaporator Coil

Possible Causes:

  • Dirty air filter

  • Low refrigerant

  • Blocked return vents

  • Running the system with low airflow

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