5 Warning Signs Your Aircon Needs an Urgent Chemical Overhaul

A chemical overhaul is the most intensive restoration procedure for a wall-mounted air conditioner. Unlike standard on-the-wall servicing, an overhaul involves completely dismounting the fan coil unit from your wall to submerge every single piece in a deep chemical bath.

Here are 5 clear warning signs that your unit requires an urgent chemical overhaul.

1. Ice Blockages Forming on Coils and Copper Pipes

If you see ice crystals or frost forming behind the front filter or on the outdoor brass valves, your aircon's heat exchange process is severely restricted. This is usually caused by heavy dirt build-up insulating the coils, forcing temperatures below freezing point.

2. Water Dripping Continuously Down the Wall

When a water drainage line is completely packed with bio-jelly and thick mold, standard drain flushing will no longer clear the blockage. Demounting the back tray during an overhaul clears 100% of the blockage, stopping wall damage.

3. Loud Rattling or Squeaking Noises from the Indoor Unit

Dirt accumulating unevenly on the cylindrical fan blower wheel causes imbalance. As the blower spins at high speeds, this imbalance creates loud vibrations, squeaks, and excessive motor strain.

4. Weak Airflow Even at Maximum Fan Speed

When dust penetrates deep into the secondary coil layers, it blocks the narrow air passages completely. Even if your fan motor is running at top speed, only a trickle of air escapes.

5. High Electricity Bills with Poor Cooling

When internal components are choked, the compressor must run continuously without cycling off. This dramatically inflates your monthly SP Group utility bill while delivering minimal cooling comfort.

Conclusion

Investing in a chemical overhaul resets your neglected aircon back to near-factory condition, saving you thousands of dollars compared to buying a brand-new system.