It is one of the most frustrating experiences for a homeowner: you just paid for a professional cleaning, but your aircon is not cold even after servicing. With Singapore homeowners suffering through intense heat and humidity, waiting for a newly serviced air conditioning system to start blowing cold air—only to be blasted with warm air—is a major letdown.
If you are wondering why is my aircon not cold after cleaning?, the answer usually lies in issues that a basic general wash cannot fix. Here are the 4 most common reasons why your air conditioner is still producing warm air, and exactly what you need to do to restore the chill.
Here are the 4 most common reasons why your air conditioner is producing warm air despite being properly serviced.
1. Your Aircon Has a Refrigerant (Gas) Leak
A standard general servicing involves washing the filters, vacuuming the drain pipe, and wiping down the covers. It does not fix gas leaks. If your aircon is not cooling after cleaning, you likely have low refrigerant levels. When the gas is low, the system simply cannot absorb heat from your room. A professional technician will need to conduct a pressure test, patch the leak, and perform an aircon gas top-up.
2. The Condenser or Compressor is Faulty
The outdoor unit (condenser) houses the compressor—the heart of your air conditioning system. If the compressor fails or the outdoor fan motor breaks down, the refrigerant cannot circulate. Even if your indoor unit is spotlessly clean, a locked or damaged compressor means the aircon will not blow cold air. This is a major mechanical issue that requires immediate professional repair or replacement.
3. The Evaporator Coils are Frozen
Sometimes, a severe lack of refrigerant or a malfunctioning internal blower fan can cause the indoor evaporator coils to freeze over with solid ice. When this happens, the ice physically blocks the airflow, resulting in warm air or a drastic reduction in wind speed. If you open your front cover and notice a block of ice behind your newly cleaned filters, turn the unit off immediately to prevent permanent damage to the motor.
4. The Initial Servicing Was Incomplete
Not all servicing is created equal. If the previous technician only washed the external filters but ignored a heavily choked indoor coil or a deeply clogged outdoor condenser, the system will still struggle to release heat. In cases of severe dust and grime buildup inside the internal fins, a simple wipe-down isn’t enough; your unit likely requires a full chemical overhaul to fully restore its cooling capacity.
| If You Notice… | The Real Problem | Recommended Solution |
|---|---|---|
| Air is blowing, but it feels like a normal fan. | Refrigerant leak / Low Gas | Pressure Test & Gas Top-Up |
| Outdoor unit is completely silent. | Faulty compressor or blown capacitor | Diagnostic Repair Check |
| Ice forming on the indoor pipes. | Frozen evaporator coils | Turn off immediately & Book a Repair |
| Airflow is very weak, even on high speed. | Internal parts are still deeply choked | Chemical Overhaul |
Frequently Asked Questions
Why is my AC not cooling even after cleaning?
If your AC is not cooling after a basic cleaning, it means the root issue is mechanical rather than dirt-related. The most common causes are low refrigerant gas, a broken compressor, or a faulty thermostat sensor that a general wash cannot fix.
Why is my aircon not as cold as before?
A gradual loss of cooling power usually indicates a slow refrigerant leak or deep grime buildup inside the condenser coils. If it has been more than a year since your last deep clean, you likely need a chemical overhaul to restore its original cooling capacity.
Still Not Feeling The Chill?
A general wash only cleans the surface. If your unit is still warm, you need a Deep Diagnostic Check to find the hidden fault.