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Aircon Not Cold Problem

You just installed a brand-new air conditioner, switched it on with excitement… and then disappointment — the aircon not cold problem appears immediately. Many homeowners assume a new unit should work perfectly from day one. But in reality, installation mistakes, configuration issues, or hidden defects can prevent proper cooling even in a newly installed system.

In Singapore’s hot and humid climate, a poorly functioning aircon quickly becomes uncomfortable. Below are the most common reasons your new aircon is blowing warm air — and what you should do about it.

• Midea Aircon Not Cold

• Daikin Aircon Not Cold

• Mitsubishi Aircon Not Cold

• Panasonic Aircon Not Cold

1. Incorrect Aircon Installation – The Most Common Cause

The number one reason a new aircon fails to cool is improper aircon installation in Singapore. Even premium brands won’t perform well if installation standards are poor.

Daikin Aircon Installation Singapore

Mitsubishi Aircon Installation Singapore

Midea Aircon Installation Singapore

Panasonic Aircon Installation Singapore

Common installation mistakes include:

• Wrong piping size

• Improper insulation

• Loose electrical connections

• Incorrect drainage slope (causes aircon water leakage)

• The outdoor unit is placed in a poorly ventilated area

When installation is rushed or done without proper testing, the cooling efficiency drops immediately.

Daikin Aircon water leaking

Midea Aircon water leaking

Mitsubishi Aircon Water Leaking

Panasonic Aircon Water Leaking

A professional team like Letscool aircon and Services Singapore ensures proper vacuuming, pressure testing, and calibration during setup. Without these steps, cooling problems appear within days or weeks.

2. Low Refrigerant Gas After Installation

Many homeowners don’t realise new aircons can still suffer gas issues. If installers fail to vacuum the pipes correctly, moisture contaminates the system and causes gas loss.

Symptoms include:

• Aircon not cold after a few days

• Ice forming on pipes

• Hissing sound

• Weak airflow

In such cases, an aircon gas top-up alone is not enough. A leak test must be done first. Otherwise, gas will escape again.

Sometimes this also leads to the aircon light blinking or an aircon error code on the display panel.

3. Dirty Internal Components Even in a New Unit

Surprisingly, a new aircon can still be dirty inside. During renovation or installation, dust from drilling and ceiling work enters the evaporator coil.

This blocks cooling immediately.

You may need:

• aircon general servicing

• aircon steam wash

• or full aircon chemical wash

If heavy debris entered during installation, a deeper aircon chemical overhaul may be required to restore cooling performance.

4. Thermostat or Sensor Calibration Issues

Modern air conditioners rely on sensors to detect room temperature. If sensors are misplaced or faulty, the system believes the room is already cold and stops cooling early.

Signs of this issue:

• Compressor stops quickly

• The temperature never reaches the setting

• Unit runs, butthe  air feels warm

Technicians must check PCB board readings and sometimes replace aircon spare parts like thermistors or control boards.

This type of fault often triggers an aircon error code, which requires professional aircon repair in Singapore rather than basic cleaning.

Daikin aircon error code

Mitsubishi Aircon Error Code

Midea Aircon Error Code

Panasonic aircon error code

5. Compressor Not Working Properly

A brand-new unit can still suffer compressor issues due to electrical faults or transport damage.

Symptoms:

• Outdoor unit silent

• Only fan running

• Warm air blowing

• Repeated aircon light blinking

Daikin Aircon Light blinking

Mitsubishi aircon light blinking

Midea aircon light blinking

Panasonic Aircon Light blinking

This is a serious issue requiring aircon compressor servicing. Without the compressor, cooling cannot happen at all.

Many homeowners mistakenly request cleaning when actually repair is needed.

6. Wrong System Size for Your Room

Even a perfect installation won’t help if the unit capacity is too small. During aircon promotion periods, homeowners sometimes choose cheaper packages without checking room sizing.

Daikin aircon promotion

Mitsubishi aircon promotion

Midea aircon promotion

Panasonic aircon promotion

Result:

• Aircon runs non-stop

• Room never cold

• Electricity bill increases

A proper heat load calculation should be done before installation. Reliable providers include this in their aircon service contract planning process.

When Should You Call a Technician?

Contact professionals immediately if you notice:

• Aircon not cold after installation

• Aircon water leakage

• Aircon light blinking

• Aircon error code display

• Loud outdoor unit

• Weak airflow

Delaying service can damage the compressor and increase repair costs.

Prevent Future Cooling Problems

After installation, schedule routine maintenance:

• Quarterly aircon servicing Singapore

• Annual deep cleaning

• Gas pressure check

• Electrical inspection

Choosing the best aircon servicing in Singapore prevents early system failure and protects your warranty.

Daikin Aircon Service Singapore 

Mitsubishi Aircon Service Singapore 

Midea Aircon service Singapore 

Panasonic Aircon Service Singapore 

Final Thoughts

A new aircon should cool instantly. If it doesn’t, the issue is almost always installation quality, gas leakage, or calibration errors — not the brand itself.

Don’t ignore early warning signs. Quick diagnosis by Letscool aircon and Services Singapore can restore cooling and prevent costly repairs later.

Regular maintenance, proper setup, and professional support are the keys to keeping your home cool, efficient, and comfortable all year round.

Aircon servicing Singapore

Aircon installation

11 Mandai Estate,

 #05-15 Eldix,

Singapore 729908

Mail ID: info@letscoolaircon.com.sg

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

Installation - Call: +65 94507178  (or) WhatsApp us: https://wa.me/6594507178

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