Split Type Aircon Not Cooling

Introduction

A split type aircon that’s not cooling is a frustrating problem, especially during hot weather. It’s more than just an inconvenience; it can make your home unbearable and even affect your health. This often happens when the aircon hasn’t been properly maintained or when a component malfunctions. Don’t panic! Before calling a technician, let’s walk through some common causes and simple fixes you can try yourself.

Common Causes of Split Type Aircon Not Cooling

Several things can lead to your split type aircon blowing warm air:

Dirty Air Filters: A clogged filter restricts airflow, making the aircon work harder and cool less effectively.
Dirty Coils: The outdoor unit’s coils release heat. If they’re dirty, they can’t do this efficiently.
Refrigerant Leak: Low refrigerant levels mean less cooling power.
Frozen Evaporator Coil: This happens when airflow is restricted (usually by a dirty filter) and causes ice to form on the indoor coil.
Blocked Condenser Fan: The fan helps cool the outdoor unit. If it’s blocked, the aircon can overheat.
Faulty Compressor: The compressor is the heart of the aircon. If it fails, the aircon won’t cool.
Capacitor Problems: Capacitors help start and run the fan and compressor motors. A failing capacitor can prevent these components from working properly.
Thermostat Issues: If the thermostat isn’t set correctly or is malfunctioning, it might not be signaling the aircon to cool.
Dirty Blower Wheel: Located inside the indoor unit, a dirty blower wheel impedes airflow.
Leaky or Poorly Insulated Ductwork (for ducted split systems): Air leaking from ducts reduces efficiency.

Symptoms Checklist

Use this checklist to pinpoint your problem:

Aircon blows warm air instead of cool air.
The aircon runs constantly but doesn’t cool the room.
You hear unusual noises coming from the indoor or outdoor unit.
Ice is visible on the indoor unit’s coils.
The outdoor unit’s fan isn’t spinning.
The thermostat display is blank or unresponsive.
The energy bill is unusually high.
Visible dirt or debris on the air filters or outdoor unit.

How to Fix Split Type Aircon Not Cooling Step-by-Step Guide

Follow these steps to troubleshoot your aircon:

Check the Thermostat: Make sure the thermostat is set to “Cool” and the temperature is lower than the current room temperature.
Inspect the Air Filter: Remove the air filter (usually located in the indoor unit) and check if it’s dirty. If it is, clean or replace it.
Clean the Air Filter: Wash reusable filter with soap. Let it dry before installing to the unit.
Clean the Outdoor Unit: Turn off the power to the aircon. Remove any debris, leaves, or branches from around the outdoor unit. Use a hose to gently clean the coils from the outside in. Avoid high-pressure spray, which can damage the fins.
Check for Ice on the Indoor Coil: If you see ice, turn off the aircon and let it thaw completely (this could take several hours). Then, clean or replace the air filter to prevent it from freezing again.
Inspect the Condenser Fan: Make sure the fan blades are clean and can spin freely. Remove any obstructions.
Reset the Aircon: Turn off the aircon at the circuit breaker for 30 minutes, then turn it back on. This can sometimes reset the system and resolve minor issues.
Check for Leaks Around the Indoor Unit: Look for any signs of water leakage around the indoor unit. This could indicate a clogged drain line.
Clean the Blower Wheel (If Accessible): If you’re comfortable disassembling the indoor unit, you can clean the blower wheel. Use a soft brush and vacuum to remove dust and debris. Proceed with caution. If unsure, skip this step.
Inspect Ductwork (If Applicable): Check for any obvious leaks or damage to the ductwork. Seal any leaks with duct tape or sealant.
Observe the System: After performing these steps, turn the aircon back on and monitor its performance. Give it some time to cool the room.
Check the Fuses/Breakers: Verify that the circuit breaker for the aircon hasn’t tripped. Replace any blown fuses.

Fix the Issue Without Buying Parts

Many cooling problems can be solved without spending money:

Regular Cleaning: Cleaning air filters and the outdoor unit coils regularly (every 1-3 months) is crucial for maintaining optimal performance.
Thermostat Calibration: Check your thermostat’s manual for instructions on how to calibrate its temperature readings.
Visual Inspection: Regularly inspect the aircon for any signs of damage, leaks, or debris.
Proper Ventilation: Ensure proper ventilation around the outdoor unit. Don’t block it with plants or other objects.
Resetting: As mentioned above, simply resetting the aircon can sometimes resolve minor glitches.

When Replacement Might Be Necessary

If you’ve tried all the troubleshooting steps and your aircon still isn’t cooling, it might be time to consider replacement. Common parts that fail include the compressor (expensive, $500-$1200 installed), the capacitor ($50-$200 installed), or the entire unit. A new split type aircon unit (installed) can range from $800 to $3000 depending on the size and efficiency.

Safety Warning

Always turn off the power to the aircon at the circuit breaker before performing any maintenance or repairs.
Avoid touching any electrical components with wet hands.
Be careful when working on ladders or elevated surfaces.
If you’re not comfortable performing a task, don’t hesitate to call a qualified technician.
Do not puncture or damage refrigerant lines.

Tools You May Need

Screwdrivers (Phillips and flathead)
Wrench set
Vacuum cleaner with brush attachment
Garden hose with nozzle
Fin comb (for straightening coil fins – optional)
Duct tape (for sealing ductwork – if applicable)

FAQ

Here are some common questions about aircon cooling problems:

Q: My aircon is blowing air, but it’s not cold. What could be the problem? A: This is most likely due to a dirty air filter, dirty coils, or low refrigerant levels. Try cleaning the filter and coils first.
Q: How often should I clean my air filters? A: Generally, you should clean or replace your air filters every 1-3 months, depending on usage and air quality.
Q: How do I know if my aircon is low on refrigerant? A: Signs of low refrigerant include weak airflow, ice buildup on the coils, and the aircon running constantly without cooling properly. You will need a professional to check and recharge the system.
Q: Why is my aircon making a loud noise? A: Loud noises can indicate a problem with the fan motor, compressor, or other components. It’s best to have a technician diagnose the issue.
Q: Can I add refrigerant to my aircon myself? A: No, you should never attempt to add refrigerant to your aircon yourself. Refrigerant handling requires specialized equipment and training. Improper handling can damage the system and harm the environment.

Conclusion

Don’t let a split type aircon that’s not cooling ruin your comfort! By following this troubleshooting guide, you can often identify and fix common issues yourself. Remember to prioritize safety and perform regular maintenance to keep your aircon running efficiently. If you’re unable to resolve the problem or are uncomfortable performing any of these steps, don’t hesitate to call a qualified HVAC technician.