Aircon Not Cooling — Overhaul Uncovered the Real Blockage

What Was Happening

Customer reported:

• Weak cooling across the room

• Musty smell after 15–20 minutes of use

• Unit hadn’t been serviced in over 2 years

• Filters were cleaned regularly, but the problem persisted

What We Found

Full Internal Choke

• Blower fan coated in hardened dust, grease, and biofilm

• Coil blocked with thick particulate buildup, severely restricting heat exchange

• Drain pan showed early mold growth, risk of clogging and odour

• Filter looked manageable — but everything behind it was choked

 Internal blockage cleared during full overhaul — not just a surface clean

What We Did

• Fully dismantled indoor fan coil unit

• Removed blower, cover panels, filter housing, and coil tray

• Performed chemical flush on coil, fan, drain, and casing

• Cleaned and disinfected each component separately

• Reassembled unit and tested airflow, drainage, and temperature

The Result

• Cooling fully restored

• Airflow balanced and strong

• Smell eliminated at source

• Drain pan now clear and dry — no moisture accumulation

What Could’ve Gone Wrong

• Blocked airflow would force the system to overwork, spiking energy use

• Mold growth in fan housing could worsen indoor air quality

• Coil strain could reduce cooling lifespan or trigger sensor errors

• Drain choke could cause internal leaks or wall damage

What This Case Shows

Filter cleaning isn’t enough.

When the internal coil and blower are packed like this, only a full chemical overhaul clears the root cause. If you’ve never seen your unit dismantled — you’ve never seen the full picture.