What causes aircon compressor failure?

Aircon Compressor Failure

Your aircon compressor is like the heart of the cooling system. Without it, your aircon simply cannot function. When the compressor fails, it can result in major airon repair costs or even a complete system replacement. At LetsCool Aircon and Services, we frequently encounter cases where the compressor has stopped working—often due to causes that could have been prevented with proper maintenance.

In this article, we will break down what causes aircon compressor failure, how to spot the warning signs early, and what you can do to prevent this costly problem—especially in Singapore’s hot and humid climate, where aircons work harder than in most parts of the world. View more.

What is an Aircon Compressor?

Before diving into the causes of failure, it helps to understand what the compressor actually does. The compressor is a key component in your air conditioner that pumps refrigerant through the system. It compresses the refrigerant gas and circulates it through the evaporator and condenser coils to enable heat exchange and cool your space.

When the compressor fails, the cooling cycle is interrupted, and your aircon will no longer provide cold air.

Common Causes of Aircon Compressor Failure1. Lack of Maintenance

This is the most common and preventable reason for compressor failure. Dirty filters, blocked coils, and clogged drainage can force the compressor to work harder, leading to overheating and eventual breakdown. At LetsCool, we always emphasize regular servicing to avoid such situations.

2. Refrigerant Issues (Too Much or Too Little)

If the refrigerant charge is incorrect—whether it’s too low due to a leak or too high from improper refilling—the compressor can suffer. Low refrigerant levels cause the compressor to overheat, while overcharging increases pressure and can cause internal damage.

3. Electrical Problems

Faulty wiring, power surges, or damaged contactors can all lead to electrical failures inside the compressor. These issues may result in the compressor motor burning out. At LetsCool, our technicians use advanced diagnostic tools to identify and fix these problems early on.

4. Blocked or Dirty Condenser Coils

When the outdoor condenser coils are covered in dust or debris (a common issue in urban Singapore), heat cannot escape efficiently. This causes the compressor to overwork and overheat, which can shorten its lifespan significantly.

5. Contaminants in the System

Dust, moisture, and even air entering the refrigerant line can contaminate the system. This often happens when improper installation or repair work is done. Contamination can clog internal components and restrict refrigerant flow, eventually damaging the compressor.

6. Inadequate Lubrication

Like any motor, your aircon compressor needs proper lubrication to function smoothly. If there is a lack of oil, or if the oil is contaminated, the internal parts can grind against each other and cause mechanical failure.

7. Age and Wear

Even with the best care, compressors have a limited lifespan. Most last between 8 to 12 years, depending on usage and maintenance. If your aircon is old, the compressor may simply be worn out from years of use.

Signs That Your Compressor Might Be Failing

At LetsCool Aircon and Services, we advise our customers to look out for these early warning signs:

• Warm air blowing from the indoor unit

• Loud noises like rattling, hissing, or grinding

• Aircon not turning on, despite power supply

• Frequent circuit breaker trips when the aircon runs

• Refrigerant leaks or unusual smells

• Short cycling (aircon turns on and off rapidly)

If you notice any of these signs, it’s best to call in professionals before the compressor completely fails.

Can You Repair a Failed Compressor?

The answer depends on the extent of the damage. In some cases, components like capacitors or contactors can be replaced, and the compressor may work again. However, if the compressor motor is burned out or the internal parts are damaged, the entire unit may need to be replaced.

At LetsCool, our team will inspect your system thoroughly and give you a clear recommendation—whether repair or replacement is the better long-term solution.

How to Prevent Compressor Failure – Pro Tips from LetsCool

1. Regular Servicing

   Schedule professional aircon servicing every 3–6 months, especially in Singapore, where aircons are used frequently. Our technicians will clean coils, check refrigerant levels, and ensure smooth operation.

2. Install a Voltage Stabilizer

   Sudden voltage spikes can damage the compressor. A stabilizer helps protect your aircon from electrical surges.

3. Fix Refrigerant Leaks Promptly

   If you suspect a leak, don’t delay. Low refrigerant can quickly damage the compressor. LetsCool offers quick leak detection and refill services for all major brands.

4. Use a Trusted Installation Service

   Proper installation makes a big difference. At LetsCool, our experienced installers ensure your system is correctly set up with no contamination or incorrect refrigerant levels.

5. Don’t Overwork Your Aircon

   Avoid setting your aircon to the lowest temperature for extended periods. A setting between 23°C and 25°C is energy-efficient and reduces compressor strain.

Why Choose LetsCool Aircon and Services?

With over 25 years of experience, LetsCool Aircon and Services has become a trusted name in the Singapore aircon industry. We provide:

• • Expert installation and servicing for all aircon brands, including Daikin, Mitsubishi, Panasonic, Midea, and more
• • Reliable diagnosis and repair of compressor issues
• • Affordable aircon maintenance packages for homes and offices
• • Chemical wash and overhaul services to extend your aircon’s lifespan
• • Free site surveys and transparent pricing
• • 90-day workmanship warranty

Whether it’s a small issue or a major compressor failure, our team of certified technicians is here to help.

Final Thoughts

Compressor failure is one of the most serious issues that can affect your aircon. But the good news is that most causes are preventable with proper care and regular servicing. At LetsCool Aircon and Services, we’re committed to helping Singapore homeowners and businesses get the most out of their aircon systems—efficiently, affordably, and reliably.

BrindhaSEO is a passionate content writer with a knack for crafting engaging and informative articles. With a background in digital marketing,