Aircond Drainage Repair for Water Leaking Unit in Mont Kiara

The Problem

Mr. Tan discovered water dripping down his wall behind the aircond unit in his Mont Kiara serviced apartment. The paint was already peeling, and he noticed a musty smell whenever the AC ran—a sign of hidden mold growth.

The unit was 8 years old and had never had its drainage system properly cleaned. What started as occasional drips had become a steady leak that was damaging his wall and creating a health hazard. The building management warned him the water could seep into the unit below.

Our Assessment

When our technician arrived, he immediately checked the drainage system. The problem was clear—the drain pipe was almost completely blocked.

Upon inspection, we found:

Drainage problems are a common cause of aircond water leaks. In this case, the original drainage installation had an incorrect slope that prevented proper water flow — a problem that no amount of cleaning can fix.

• Thick algae sludge blocking the drain pipe – Years of condensation had created a perfect environment for algae growth, reducing water flow to a trickle
• Biofilm coating inside the drainage tray – A slimy layer that was trapping water instead of letting it drain properly
• Early mold growth on the wall – The constant moisture had started black mold formation behind the unit, hidden from view

Simple unclogging wouldn't solve this. We recommended comprehensive drainage repair service to clear the blockage and prevent it from recurring.

The Chemical Wash Process

Our technician laid protective sheets below the unit and got to work. The entire repair took about 1 hour:

• Step 1: Remove and wash air filters
• Step 2: Cover electrical components and motor
• Step 3: Apply chemical solution to evaporator coils
• Step 4: Let solution dissolve grime for 10-15 minutes
• Step 5: High-pressure rinse to flush out debris
• Step 6: Clean drainage tray and flush drain pipe
• Step 7: Clean blower fan blades
• Step 8: Reassemble and test

The amount of black water that came out during rinsing shocked even our technician-a clear sign of how much buildup had accumulated over 2 years.

The Results

Maintenance Recommendations

We advised Mr. Tan to schedule regular aircond service in Mont Kiara every 4-6 months to prevent this level of buildup from happening again. To prevent drainage issues from recurring, we recommended:

• Monthly filter cleaning (DIY-just rinse with water)
• Professional drainage flush every 6 months
• Check for water stains monthly—early detection prevents damage

If your aircond hasn't been serviced in a while, you might also be dealing with mold buildup inside the unit. Check out our chemical wash project in Bangsar where we removed severe mold causing allergy symptoms.