Posted on Aug 8, 2026 by Sayasai

Aircon Not Cold

Installing a new air conditioner should provide immediate cooling and improved comfort. However, many homeowners in Singapore are surprised when they discover their aircon not cold even after a brand-new installation. If your newly installed air conditioner is blowing warm air or struggling to cool your room, several factors could be responsible. Fortunately, most of these issues can be diagnosed and resolved quickly by experienced professionals.

At LetsCool Aircon and Services Singapore, we frequently help customers who experience cooling problems shortly after installation. Whether the issue is related to incorrect installation, refrigerant levels, electrical faults, or system configuration, understanding the possible causes will help you take the right action.

In this guide, we'll explain the most common reasons why your aircon is not cold after installation, how to prevent future problems, and why professional aircon servicing Singapore is essential for long-term performance.

1. Incorrect Aircon Installation

One of the most common reasons a newly installed air conditioner fails to cool properly is poor workmanship during the installation process.

Improper installation may include:

• Incorrect refrigerant pipe connections

• Poor vacuuming before gas charging

• Loose electrical wiring

• Wrong indoor or outdoor unit positioning

• Improper drainage installation

Even premium air conditioning brands can perform poorly if the installation is not done correctly.

Choosing a trusted company for aircon installation Singapore helps ensure your system operates efficiently from day one. Experienced installers follow manufacturer guidelines, perform pressure testing, and inspect every connection before commissioning the unit.

View More: How to Choose a Mitsubishi Aircon for Your Home or Office

2. Low Refrigerant Due to Installation Leaks

A new air conditioner should never run low on refrigerant immediately. However, if refrigerant piping isn't properly tightened or tested during installation, small leaks may occur.

Signs include:

• Aircon blowing warm air

• Longer cooling time

• Ice forming on the indoor coil

• Higher electricity bills

If refrigerant leakage is detected, professional technicians will repair the leak before performing an aircon gas top up. Simply topping up refrigerant without fixing the leak is only a temporary solution.

Professional leak detection prevents recurring cooling problems and protects your compressor.

3. Wrong Aircon Size for the Room

Another overlooked reason for an aircon not cold problem is choosing an air conditioner with insufficient cooling capacity.

For example:

• Small bedroom: 9,000 BTU

• Medium bedroom: 12,000 BTU

• Living room: 18,000–24,000 BTU or more

If the installed unit is too small, it will continuously run without reaching the desired temperature.

Professional installers calculate:

• Room size

• Ceiling height

• Sun exposure

• Number of occupants

• Heat-producing appliances

before recommending the appropriate system.

4. Faulty Components or Manufacturing Defects

Although uncommon, new units may occasionally have defective components.

Possible faulty parts include:

• Capacitors

• Fan motors

• Sensors

• PCB boards

• Compressors

Some customers may also notice:

• Aircon light blinking

• Aircon error code displayed

• Compressor not starting

• Indoor fan stopping unexpectedly

These issues should be diagnosed immediately under the manufacturer's warranty. Experienced technicians from LetsCool Aircon and Services Singapore can identify whether the fault is covered under warranty or requires repair.

If replacement components are needed, genuine aircon spare parts should always be used to maintain system reliability.

5. Blocked Airflow or Installation Obstructions

Even after installation, airflow problems can prevent proper cooling.

Common examples include:

• Curtains blocking airflow

• Furniture placed directly below the unit

• Dirty filters from renovation dust

• Poor outdoor unit ventilation

• Closed air vents

After home renovations, construction dust can quickly clog filters and reduce cooling performance.

A simple aircon general servicing may be enough to restore proper airflow if dirt has accumulated soon after installation.

For heavily contaminated units, an aircon steam wash or aircon chemical wash may be recommended to clean internal components thoroughly.

6. Compressor or Drainage Issues

Your outdoor compressor is the heart of the cooling system.

If the compressor is not functioning correctly, the indoor unit may run but produce little or no cold air.

Possible causes include:

• Faulty compressor wiring

• Electrical voltage issues

• Compressor protection mode

• Refrigerant pressure imbalance

Professional aircon compressor servicing helps diagnose these problems before serious damage occurs.

Improper drainage installation may also lead to aircon water leaking, which often indicates blocked drain pipes, incorrect pipe slopes, or installation errors. Addressing drainage issues early prevents water damage and mould growth.

In severe cases where internal components become heavily contaminated over time, an aircon chemical overhaul may be recommended to restore peak cooling performance.

How Regular Servicing Prevents Cooling Problems

Even newly installed air conditioners require ongoing maintenance to remain efficient.

Routine aircon servicing Singapore helps:

• Maintain strong cooling performance

• Improve airflow

• Detect refrigerant leaks early

• Reduce electricity consumption

• Prevent compressor damage

• Extend system lifespan

Many homeowners also choose an aircon service contract, which includes scheduled servicing throughout the year. This ensures your air conditioner remains in excellent condition without having to remember maintenance appointments.

At LetsCool Aircon and Services Singapore, affordable servicing packages and seasonal aircon promotion offers make preventive maintenance more cost-effective.

Why Choose LetsCool Aircon and Services Singapore?

When your newly installed air conditioner isn't cooling properly, fast diagnosis is essential.

Our experienced technicians provide:

• Professional aircon installation

• Comprehensive diagnostics

• Aircon repair Singapore

• Aircon general servicing

• Aircon chemical wash

• Aircon chemical overhaul

• Aircon steam wash

• Aircon gas top up

• Aircon compressor servicing

• Genuine aircon spare parts replacement

• Affordable aircon service contract packages

Whether your issue involves installation errors, refrigerant leaks, compressor faults, or electrical problems, our team provides reliable solutions for residential and commercial properties across Singapore.

Conclusion

If you're wondering, "Why is my aircon not cold after installation?", the answer often lies in installation quality, refrigerant leaks, system sizing, airflow restrictions, or faulty components. Although these problems can be frustrating, they are usually repairable when diagnosed early.

Instead of waiting for the problem to worsen, contact experienced professionals like LetsCool Aircon and Services Singapore. Proper installation, routine maintenance, and timely aircon repair Singapore services will keep your air conditioning system operating efficiently for many years.

Aircon servicing Singapore

Aircon installation

11 Mandai Estate,

 #05-15 Eldix,

Singapore 729908

Mail ID: info@letscoolaircon.com.sg

Service -WhatsApp Call: +65 9862 3678 

Installation - WhatsApp Call: +65 94507178 

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