7 Signs Your Aircon Compressor Is Failing

Aircon Compressor

In Singapore’s tropical heat, your air conditioner works harder and longer than in most other countries. At the heart of every aircon system is the compressor – the component responsible for pumping refrigerant and keeping your home or office cool. It’s often referred to as the "engine" of your aircon. If it starts to fail, the entire system’s performance is compromised.

At LetsCool Aircon and Services, we’ve handled thousands of aircon repairs across Singapore. One of the most serious and costly problems we see is a failing compressor. Catching the warning signs early can save you from expensive repairs or even a complete system replacement. Here are 7 signs your aircon compressor might be failing – and what you can do about it. View more.

1. Warm Air from the Vents

One of the most obvious signs that something is wrong with your compressor is when the aircon blows warm or room-temperature air instead of cold. The compressor’s job is to circulate refrigerant through the coils to cool the air. When it fails, this cooling process is disrupted, and your aircon can no longer do its job.

If you’ve checked your settings and cleaned the filters but still feel warm air, it’s time to call in professionals. At LetsCool, we’ll diagnose the issue accurately and let you know whether your compressor is the culprit.

2. Strange Noises from the Outdoor Unit

Your outdoor compressor unit should run quietly. If you start hearing banging, clanking, or hissing sounds, these are signs of trouble. Rattling or grinding noises might indicate loose internal components, while hissing could signal a refrigerant leak.

Noises coming from the outdoor condenser unit shouldn’t be ignored. The longer you wait, the more damage can occur. LetsCool’s experienced technicians can perform a detailed inspection and resolve issues before the compressor fails completely.

3. Compressor Doesn’t Turn On

If your aircon is on but the outdoor unit is silent or not running, your compressor might have already failed. Sometimes the fan might run, but the compressor doesn’t kick in – which means the cooling process isn’t happening at all.

This could be due to electrical faults, capacitor failure, or internal damage to the compressor. At LetsCool, we use professional diagnostic tools to check power flow, voltage levels, and refrigerant pressure to confirm whether the compressor is the issue.

4. Tripping Circuit Breaker

If your aircon keeps tripping your circuit breaker, it’s a sign that your system is overloading your electrical circuit – and a failing compressor could be to blame. Compressors draw a lot of power, and when they’re failing or seizing up, the system may attempt to compensate by drawing even more current.

This creates a safety risk, not just for your aircon, but for your electrical system. If your circuit breaker trips frequently when the aircon is turned on, contact LetsCool immediately for a system check-up.

5. Vibrations or Shaking When Starting Up

When an aircon unit shakes or vibrates excessively at startup, it can indicate a problem with the compressor motor or internal parts coming loose. Known as "hard starting," this condition means your compressor is struggling to start – a common early sign of impending failure.

If you notice these symptoms, especially with older systems, a compressor replacement may be imminent. LetsCool offers free assessments to help you determine whether repairs or replacement are the better long-term solution.

6. Reduced Airflow and Cooling Efficiency

If your aircon is still working but the cooling is weak or inconsistent, and your airflow feels sluggish, it could be a sign of low refrigerant pressure or a compressor not functioning at full capacity.

This reduced efficiency not only makes your space less comfortable, but also drives up your energy bills. An underperforming compressor means longer cooling cycles and higher electricity usage. At LetsCool, we perform pressure tests and airflow analysis to pinpoint whether the compressor is the cause.

7. Leaks or Puddles Around the Outdoor Unit

While a little condensation is normal, visible puddles or refrigerant leaks are not. A failing compressor can cause refrigerant to leak, especially if internal seals or valves are damaged.

Refrigerant leaks are harmful to both the environment and your health. If you notice oily residue or an unusual smell near your outdoor unit, it’s time to schedule servicing. LetsCool offers comprehensive inspections and refrigerant leak repair services for all major aircon brands.

What Causes Compressor Failure?

Compressor issues can arise due to several reasons, including:

• Age and wear

• Lack of regular maintenance

• Refrigerant leaks or overcharging

• Electrical failures

• Dirty coils and blocked filters

That’s why regular aircon servicing is essential, especially in Singapore’s demanding climate. Preventive maintenance helps catch these issues before they escalate.

Repair or Replace – What’s the Best Option?

Compressor replacements are one of the most expensive aircon repairs, and in some cases, it may make more sense to replace the entire system—especially if the unit is older than 8 to 10 years.

At LetsCool, we provide honest, expert advice. If your compressor can be repaired affordably and safely, we’ll recommend it. If not, we offer a range of energy-efficient replacements from trusted brands like Mitsubishi Electric, Daikin, Panasonic, and Hitachi, all backed by professional installation and workmanship warranty.

Trust LetsCool – Singapore’s Aircon Specialists

With over 25 years of experience in the industry, LetsCool Aircon and Services is your trusted partner for aircon servicing, repair, installation, and compressor replacement in Singapore. Our technicians are highly trained, and we support all major aircon systems including System 1 to System 4 and VRV models.

We offer:

• Fast and reliable service across Singapore

• Transparent pricing with no hidden fees

• Non-obligated site surveys

• A 90-day workmanship warranty on repair jobs

Final Thoughts

Your aircon’s compressor is critical to keeping your environment cool and comfortable. If you’ve noticed any of the signs above, don’t ignore them. Early detection can save you from costly repairs or replacements down the road.

Call LetsCool Aircon and Services today at +65 9862 3678 to schedule a diagnostic visit or aircon servicing. We’ll help you stay cool—efficiently and affordably.

11 Mandai Estate,

#05-15 Eldix,

Singapore 729908

Mail ID: info@letscoolaircon.com.sg

Call: +65 9862 3678 (or) WhatsApp us: https://wa.me/6598623678

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