Aircon units are crucial in maintaining a comfortable living space, especially in hot and humid climates like Singapore. However, when your aircon starts producing strange noises, it can be a cause for concern. These unusual sounds can indicate a malfunction that requires immediate attention. If you hear loud or unfamiliar sounds coming from your aircon, it is important to act quickly to prevent further damage and maintain its efficiency.
Here’s what you need to know and what you should do if your aircon is making strange noises.
Strange Noises from Your Aircon
It’s normal for an aircon to make a faint hum when running, but loud or unusual noises should not be ignored. These sounds often point to internal issues that may worsen if not addressed.
1. Banging or Clanking Noises
What It Means: Banging or clanking sounds often indicate that something has come loose inside the aircon unit. This could be a loose fan blade, compressor issues, or disconnected parts. These noises are often loud and can sometimes be heard when the aircon is starting up or shutting down.
What to Do:
- Turn off the aircon immediately to prevent further damage.
- A technician will need to inspect and tighten the parts if the issue is related to a loose part, like a fan or motor.
2. Hissing or Whistling Sounds
What It Means: A hissing or whistling sound often suggests a refrigerant leak or a blocked air duct. Moisture on the coils can also cause the hissing sound. A refrigerant leak is a particularly serious issue that can affect your unit’s cooling performance.
What to Do:
- Stop using the aircon to prevent further refrigerant loss.
- Call a professional technician who can safely locate and repair the refrigerant leak.
3. Grinding Noises
What It Means: Grinding noises usually indicate that the fan motor or another moving part inside the unit is malfunctioning. This could be due to dirt, debris buildup, or the wear and tear of moving parts.
What to Do:
- Turn off the unit immediately and inspect the fan for debris.
- Call a technician to inspect the motor or other moving parts for damage if the grinding continues.

Why You Should Call a Professional for Aircon Issues
While some basic maintenance tasks homeowners can do themselves, aircons are complex systems requiring specialized knowledge to repair safely. Here are a few reasons why it’s always better to call a professional:
1. Expertise in Diagnosing Issues
Aircon systems can have various issues, from electrical faults to refrigerant leaks. Professional technicians are trained to identify problems that might not be immediately obvious, saving you time and hassle. They also know how to fix problems effectively without causing further damage.
2. Safety Concerns
Handling electrical components or refrigerants can be dangerous without proper training. A professional technician will ensure that repairs are done safely, preventing potential harm to you and your home.
3. Warranty Protection
If your aircon is still under warranty, attempting DIY repairs can void the warranty. Calling a certified professional ensures that the warranty remains intact while resolving the issue quickly.
4. Long-Term Savings
Though professional repairs may seem costly upfront, they often save you money in the long run by preventing more expensive issues from developing. Regular servicing also helps to keep your aircon running at peak efficiency, reducing energy consumption and lowering utility bills.
Final Thoughts
Aircons are an investment that should last for many years, but when they begin emitting strange noises or foul smells, it’s essential to act quickly to address the issue. While some minor problems can be handled with DIY repairs, serious issues like refrigerant leaks, electrical faults, or mold buildup require the expertise of a professional technician.
Recognizing the signs early and understanding when replacement is necessary will ensure your home remains comfortable and energy-efficient. Regular maintenance and timely repairs not only ensure your aircon continues to run smoothly but also improve the air quality in your home.
If your aircon is making strange noises or emitting unpleasant smells, don’t hesitate to call in a professional. With expert help, you can restore your home’s cooling system to its optimal state and continue enjoying a comfortable environment, no matter the weather outside.
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