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.
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:
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: [email protected]
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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