LS Aircon Servicing Singapore

logo
Menu
aircon making a screeching noise

Why Is My Aircon Making a Screeching Noise

/ Blog / By

An aircon making a screeching noise can indicate a serious issue in the unit. An aircon is vital for keeping your home comfortable, especially in Singapore’s hot and humid weather. But if your aircon starts making a loud screeching noise, it’s annoying and can also be a sign that something might be wrong.

Understanding the cause of this noise can help you address the issue promptly and prevent further damage. In this article, we’ll explore the common reasons why an aircon might make screeching sounds and provide some suggestions on what to do next.

Why is My Aircon Making a Screeching Noise?

LS Aircon Servicing Singapore explains the common reasons for aircon squeaking in Singapore. Moreover, they also offer aircon chemical overhaul, aircon repair, and aircon relocation services in Singapore. Let’s explore the reasons for an AC making a screeching noise. 

1. Worn-out or Loose Fan Belt

In older aircon models, the fan belt connects the motor to the fan. Over time, this belt can become worn out. A loose fan belt often produces a high-pitched screeching noise when the aircon operates. This can be the most common cause of an air conditioner making a screeching noise. 

Solution

You may need to replace the fan belt. This task should ideally be handled by a professional technician.

2. Motor Bearing Issues

The aircon’s motor relies on bearings for smooth operation. If these bearings are worn out or dry, the motor can produce a screeching sound. This is often due to a lack of lubrication or normal wear and tear.

Solution

Regular maintenance can prevent this issue. If the bearings are damaged, they should be replaced by a professional.

why aircon making a screeching noise

3. Dirty or Misaligned Fan Blades

Fan blades can accumulate dirt over time or become misaligned. When this happens, the blades may scrape against the casing. Therefore, they become a cause for an aircon making a screeching noise.

Solution

Switch off the aircon and check the fan blades for dirt or misalignment. Cleaning or realigning the blades may resolve the issue. If you are unsure about it, consult a technician.

4. High Refrigerant Pressure

A malfunctioning refrigerant system can result in excessive pressure. Therefore, it causes the aircon to make a screeching noise. This is a serious issue that requires immediate attention as it may damage the aircon’s components.

Solution

Turn off the aircon and call a professional technician immediately. Do not attempt to handle refrigerant-related issues yourself, as it can be dangerous.

5. Compressor Problems

The compressor is a key component of an aircon system. Internal issues like a failing motor or excessive pressure can cause screeching noises.

Solution

Compressor issues usually require a professional diagnosis and repair. In some cases, replacing the compressor might be the only solution.

6. Faulty or Dry Pulleys

In systems with pulleys, a lack of lubrication and damaged pulleys can create a screeching noise. This is often accompanied by reduced aircon efficiency.

Solution

Lubricating the pulleys and replacing damaged ones can solve the issue. Ensure this is done by a qualified technician.

my aircon making a screeching noise

What to Do When You Hear Screeching Noises?

If you hear screeching noises coming from your aircon, here’s what you should do:

  1. Running the aircon while it’s making loud noises can worsen the problem. Therefore, you should immediately turn off the aircon unit. 
  2. Look for loose belts, dirt, or anything out of place.
  3. For complex issues like motor bearings, refrigerant pressure, or compressor problems, always consult a technician.

Preventive Measures to Avoid Screeching Noises

Regular maintenance can prevent these issues in the long run. Here are the tips for regular maintenance:

  1. Schedule Routine Servicing
  2. Clean Air Filters and Fans
  3. Monitor Performance

Conclusion

An aircon making a screeching noise is not always a minor inconvenience, but it can indicate a more serious issue. From worn-out fan belts to high refrigerant pressure, the causes can vary. However, it is crucial to address the issue promptly to avoid further damage. Regular maintenance and timely professional assistance can keep your aircon running smoothly.

Frequently Asked Questions

There can be multiple reasons for this issue. The most common issues include a broken or worn-out motor, misaligned fan blades, and refrigerant issues. In most cases, you need to call a professional to resolve them.
If your aircon system is making a high-pitched noise when off, it could be due to the blower motor. An improper electrical connection might cause the motor to emit a buzzing sound. This sound is independent of the AC's operational status.
If your aircon has a refrigerant leak issue, you will likely hear hissing sounds around the unit. Normally, the system is pressurized and will lose the pressure due to a refrigerant leak and this generates a hissing sound.