When the AC is making a strange noise, you may wonder if it’s a cause for alarm or nothing to worry about. Different noises mean different issues, which may range from simple dust and debris that you can clear out or mechanical problems that require the hands of an experienced technician.
Living in Singapore, where high-rise apartments and close proximity living are the norm, unusual aircon noises can be more than just a personal annoyance—they can disturb neighbors too!
To ensure you don’t inconvenience others and can rest comfortably, check out these 6 common AC sounds, what they mean, and what you can do to fix them!
6 Reasons for a Noisy Air Conditioner
Reason #1: Rattling or Clunking Noise Indicates Loose Parts
A rattling or clunking noise from your air conditioner is often caused by loose parts, such as fan blades, screws, or large debris trapped inside the AC unit.
Additionally we also often find this issue in our Singaporean customers who have older air conditioners—where most of the parts of the aircon have started to wear out. To prevent this issue from happening, we recommend our client to regularly maintain and inspect their air conditioner.
Clean the air filters monthly, and ensure no large debris accumulates near or inside the unit, especially during Singapore's monsoon season when leaves and dust accumulate rapidly. But if this problem already happened, immediately turn off the air conditioner and inspect the filters and internal components for loose parts or debris. If the noise persists, call a technician to diagnose the issue—beware that you might need to prepare budget to replace the aircon worn parts.
Reason #2: Humming Noise Indicates Dirty Coils
Humming noises from your air conditioner are often due to dirty evaporator or compressor coils. When these coils are covered in dust, they produce a low humming sound. In some cases, electrical issues in the compressor can also cause the noise. Prevent coil issues by cleaning your aircon at the very least once every six months.
For our clients who live near Singapore industrial areas or main roads where dust is more prevalent, we recommend they get professional servicing once every 3 months.
Reason #3: High-Pitched Squealing Noise Indicates a Refrigerant Leak
A squealing or hissing noise is a sign of a refrigerant leak. But unfortunately not many realize that this is one of the signs of a leak. For example, one of our clients reported a squealing AC. After inspection, we later found that they had a refrigerant leak which was caused by corroded pipes.
To prevent this dangerous issue from happening, ensure regular servicing of your AC to check for early signs of refrigerant leaks. Additionally, you should also avoid overworking your air conditioner, as excessive use can strain the refrigerant system.
Reason #4: Whirring Noise Indicates Stuck Debris
A whirring noise often indicates debris stuck inside the AC outdoor unit. To prevent whirring noise, we always recommend our client regularly clean the area around their outdoor unit of leaves, twigs, and other debris—which often accumulate due to Singapore’s climate and can easily clog the outdoor condenser unit.
If you notice a whirring noise in your aircon, immediately turn it off and carefully remove any visible debris. If the noise continues, contact a professional technician immediately.
Reason #5: Buzzing Noise Indicates an Issue with the Outdoor Unit
A buzzing noise from the outdoor unit often signals loose screws, broken parts, or dirt inside the condenser. Clean the outdoor unit regularly, especially after Singapore’s storms or if you live near construction activities. Additionally, you can also Install a protective cover or mesh around the condenser to minimize debris entry.
Reason #6: Clicking Noise Indicates a Faulty Control Board
A constant clicking sound, especially when the AC fails to turn on, usually points to a malfunctioning control board. This issue requires immediate attention, as delaying repairs can cause further damage.
If you notice a clicking noise from your air conditioner, immediately turn off the AC and contact a licensed technician. Attempting to repair the control board without proper expertise can cause irreparable damage to the entire unit.
Key Takeaway
While no one wants a broken air conditioner, the noises coming from your unit help figure out the issues within the appliance. If you're not confident in cleaning or fixing your unit yourself, let us take a look at your air conditioner to find out the problem!
Luce is one of Singapore’s trusted experts in air conditioning solutions. We specialize in cleaning, repair, and regular maintenance services for all types of air conditioner units.
Schedule an aircon cleaning, maintenance, or repair service with us today!
