🔊 Why Is My Aircon Noisy?

Your aircon should run quietly in the background — not sound like a mini jet engine. When strange noises start coming from your aircon, it’s often a sign that something inside isn’t working as it should.

Each sound — whether it’s rattling, buzzing, or hissing — points to a different issue. Ignoring it can lead to bigger problems like system breakdowns or expensive repairs.

Here’s what those noises usually mean and what you can do about them.

1. Rattling or Clanking Sounds

If you hear rattling or clanking, there’s likely a loose or misaligned part inside the aircon. This could be a fan blade, screw, or panel that has come loose due to vibration.

Common causes:

• Loose fan blades hitting internal parts

• Detached casing or screws

• Mounting brackets not secured properly

Solution: Turn off the aircon and call a technician to tighten and re-secure the parts before further damage occurs.

2. Buzzing or Humming

A low humming noise is normal — but loud or irregular buzzing may indicate electrical issues or a faulty compressor.

Possible causes:

• Faulty capacitor or contactor relay

• Dirty condenser coils

• Worn-out fan motor

Solution: Never ignore electrical buzzing — it can be dangerous. Schedule a professional inspection to check the compressor and wiring safely.

3. Whistling or Hissing

A hissing noise usually points to air leaks or gas issues. It could mean:

• Refrigerant (gas) is leaking

• Air escaping from loose ducts or coil joints

Solution: Gas leaks can affect cooling performance and safety. Call a technician for a gas top-up and leak test immediately.

4. Banging or Knocking

A loud bang when your aircon starts up might mean a compressor or fan motor problem.

Possible causes:

• Loose connecting rod inside compressor

• Unbalanced blower wheel

• Debris trapped in fan housing

Solution: Turn off the unit and avoid using it until inspected. Running it can damage internal components.

5. Squealing or Screeching

If your aircon screeches like it’s in distress, it could be the fan belt or motor bearings wearing out. Older aircon models with belt-driven fans are more prone to this.

Solution: Get the belt or bearings replaced. For newer inverter systems, proper lubrication of fan parts can fix the issue.

How Sky Blue Aircon Can Help

At Sky Blue Aircon Engineering Pte Ltd, we accurately diagnose noise problems before they turn into costly repairs.

Our Services Include:

• Aircon Servicing & Cleaning – Remove debris, tighten fittings, and lubricate parts.

• Fan & Motor Repair – Fix worn-out bearings and fan imbalances.

• Gas Leak Detection & Top-Up – Stop hissing noises and restore cooling.

• Electrical Component Check – Ensure safe and efficient operation.

💡 The Bottom Line

A noisy aircon isn’t just annoying — it’s a warning sign.Early servicing can fix small issues before they become major breakdowns.

📲 Message us on WhatsApp at 9248 7291 or call 6556 4042.

Sky Blue Aircon Engineering Pte Ltd – keeping Singapore homes cool, quiet, and comfortable.