Aircon Not Cold
You just installed a brand-new air conditioner — but instead of icy comfort, you feel warm air blowing. Frustrating, right? Many homeowners in Singapore assume a new unit means perfect cooling instantly. However, several technical and installation factors can cause an aircon not to be cold, even on day one.
In this guide by letscool aircon and Services Singapore, we explain the most common reasons your new system is underperforming — and what you should do before calling for aircon repair Singapore.
1. Incorrect Installation — The #1 Hidden Problem
A new unit failing to cool is often not a manufacturing defect but a setup issue. Poor aircon installation in Singapore can prevent the system from operating at full capacity.
Daikin Aircon Installation Singapore
Mitsubishi Aircon Installation Singapore
Midea Aircon Installation Singapore
Panasonic Aircon Installation Singapore
Common installation mistakes:
- Improper refrigerant pipe vacuuming
- Wrong piping length or bending
- Poor drainage slope causing aircon water leakage
- Indoor unit not level
- Outdoor condenser placed in a heat-trapped area
When installation errors occur, the aircon struggles to circulate refrigerant efficiently. This leads to warm airflow and sometimes aircon light blinking shortly after startup.
A professional installer like letscool aircon and Services Singapore ensures proper pressure testing, insulation sealing, and performance checks after installation.
2. Refrigerant Level Too Low (Gas Not Properly Charged)
Many new air conditioners fail to cool because the refrigerant gas was not filled or calibrated correctly during setup.
Signs of low refrigerant:
- Weak airflow temperature
- Ice forming on copper pipes
- Compressor running continuously
- Aircon error code on display
In this case, you may need an aircon gas top-up — even for a new unit.
Yes, it happens when installers skip vacuuming or leak testing.
Do NOT ignore this problem. Running an aircon with low gas can damage the compressor, leading to expensive aircon compressor servicing or replacement.
3. Thermostat & Sensor Calibration Issues
New systems depend on accurate sensors. If misaligned, your aircon thinks the room is colder than it actually is.
This causes:
- The compressor is stopping too early
- The fan is running but not cooling
- Sudden aircon not cold complaints
Sometimes the indoor PCB shows an aircon error code or blinking light to indicate sensor mismatch.
Daikin aircon error code
Mitsubishi Aircon Error Code
Midea Aircon Error Code
Panasonic aircon error code
A technician may:
- Recalibrate sensors
- Replace the faulty thermistor using genuine aircon spare parts
- Reset motherboard settings
This falls under professional aircon servicing Singapore, not DIY repair.
Daikin Aircon Service Singapore
Mitsubishi Aircon Service Singapore
Midea Aircon service Singapore
Panasonic Aircon Service Singapore
4. Blocked Airflow or Dirty Internal Components
Yes — even new aircons can be dirty internally.
Construction dust, drilling debris, or renovation powder enters the blower wheel and evaporator coil during installation. Within days, cooling performance drops drastically.
You may notice:
- Slight smell
- Reduced airflow
- Water dripping
- Ice formation
These remove invisible debris that blocks heat exchange. Regular aircon general servicing keeps airflow strong and prevents early wear.
5. Wrong System Size for the Room
Sometimes the aircon works perfectly — but the room is too large.
If BTU capacity is undersized:
- The room never reaches the set temperature
- Compressor runs non-stop
- Electricity bill increases
- Cooling feels weak
Many homeowners purchase during an aircon promotion without proper calculation. A professional site assessment ensures the correct system capacity before installation.
Daikin aircon promotion
Mitsubishi aircon promotion
Midea aircon promotion
Panasonic aircon promotion
When selecting a new unit, always consult specialists offering the best aircon servicing Singapore — they recommend based on:
- Room size
- Sun exposure
- Ceiling height
- Number of occupants
6. Drainage & Pressure Issues Trigger Safety Mode
Modern aircons include safety protection features. If abnormal pressure or drainage occurs, the unit reduces cooling automatically.
Common triggers:
- Choked drain pipe causing aircon water leakage
- High pressure inside the compressor
- Faulty float switch
- Condenser overheating outdoors
Daikin Aircon water leaking
Midea Aircon water leaking
Mitsubishi Aircon Water Leaking
Panasonic Aircon Water Leaking
When this happens, you may see:
- Aircon light blinking
- Aircon error code
- Fan running, but no cooling
Professional inspection with a proper aircon service contract prevents repeated shutdown cycles and protects the system's lifespan.
When Should You Call a Technician?
If your new unit shows any of these symptoms for more than 24 hours:
- Aircon not cold after installation
- Water dripping
- Blinking indicator
- Loud outdoor unit
- Error codes
- Ice forming on pipes
Do not wait. Early diagnosis prevents compressor damage.
Prevent the Problem from Returning
Even new systems require maintenance. Regular servicing ensures efficiency and warranty protection.
Recommended maintenance plan:
- Quarterly aircon general servicing
- Yearly aircon steam wash
- Deep cleaning via aircon chemical wash when airflow drops
- Aircon chemical overhaul every few years
- Annual compressor check under aircon compressor servicing
The most cost-effective option is subscribing to an aircon service contract, which keeps your unit running like new year-round.
Final Thoughts
A new air conditioner should cool instantly — but installation mistakes, gas issues, sensor faults, or airflow blockage can cause an aircon not cold right away. Ignoring early signs like aircon light blinking, aircon error code, or aircon water leaking can lead to major repairs.
Instead of guessing, get a professional inspection from letscool aircon and Services Singapore. With proper diagnosis and preventive maintenance, your aircon will deliver the cold comfort you expected from day one.
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
#airconservice #airconservicesingapore #airconservicing #airconservicingsingapore #airconservicecompany #aircongeneralservice #aircongastopup #airconsteamcleaning #airconchemicalwash #airconchemicaloverhaul #airconrepair #airconrepairservice #bestairconsingapore #airconserviceprice #airconservicepricesingapore #commercialairconservicing #Letscool #airconwaterleakage #airconpromotion #airconpromotionsingapore2026 #airconspareparts #airconinstallationsingapore #airconinstallation #daikinaircon #mitsubishiaircon #mideaaircon #panasonicaircon #airconinstallationpromotion2026 #airconsingapore #cheapestairconsingapore #bestairconsingapore #sgaircon #airconditioningservice #aircondservicing #aircondcleaning #acfix #airconsg #servicingairconsingapore