Why Is My Ac Not Blowing Warm Air?

27 May

Why Your Split System Isn’t Blowing Hot Air (or Has Stopped Entirely)

If your split system heating and cooling unit isn’t blowing hot air—or has stopped working altogether—there could be several causes. Below is a breakdown of common issues and troubleshooting steps you can take before calling a professional.

1. Check the Basics

Power Supply: Ensure the unit is receiving power. Check the circuit breaker or fuse box and reset if needed.
Thermostat Settings: Verify the thermostat is set to "Heat" and to your desired temperature.
Remote Control: Make sure the remote is working properly, has fresh batteries, and is set to the correct mode.

2. Inspect the Air Filters

Clogged or Dirty Filters: Dirty filters restrict airflow, making it harder for the system to heat effectively. Clean or replace them following the manufacturer's recommendations.

3. Examine the Outdoor Unit

Ice Buildup: Ice on the outdoor unit can interfere with heat exchange. If present, switch the system off and allow it to defrost.
Obstructions: Clear away leaves, dirt, or debris that may be blocking airflow around the unit.

4. Inspect Coils and Vents

Dirty Coils: Dirty indoor or outdoor coils can limit heat transfer. Consider professional coil cleaning for optimal performance.
Blocked Vents/Ducts: Ensure vents are open and unobstructed. Damaged or disconnected ductwork can also affect airflow.

5. Consider Refrigerant Levels

Low Refrigerant: Insufficient refrigerant can impair both heating and cooling. This is not a DIY fix—contact a licensed technician to test and recharge refrigerant levels if needed.

6. Check for Electrical Issues

Wiring and Components: Faulty wiring, blown capacitors, or malfunctioning control boards can all cause the system to fail. These typically require a technician to diagnose and repair safely.

7. Other Possible Issues

Compressor Failure: A bad compressor can stop the system from working entirely.
Fan Malfunction: If the fan isn’t working, airflow will be limited or nonexistent.
Defrost Mode: In cold weather, the unit might be in defrost mode temporarily, during which it can blow cool air. This should resolve itself within a few minutes.

When to Call a Professional

If you’ve gone through these steps and the issue persists, it’s time to call us to have our qualified HVAC technician to look at it. They have the tools and expertise to diagnose and fix more complex mechanical or electrical problems.

Call us on 1300 761 024