Neglected Casement Unit — Restored After Years Without Servicing

What Was Happening

Customer reported:

• Aircon not cold, especially in the afternoon

• Weak airflow despite high fan setting

• Dust and slight smell coming from the vents

Unit was a window-mounted casement type. Had not been serviced in several years.

What We Found

Heavy Internal Buildup

• Coil face was packed with dust and hardened lint, restricting airflow

• Blower casing was coated with grime, reducing fan output

• Drain outlet was partially blocked, causing backflow risk

• Electrical connections slightly oxidised from moisture exposure over time

This level of internal buildup accumulates silently. Externally, the unit still looked “fine”.

Servicing a long-neglected casement unit to restore airflow

What We Did

Full Service and Internal Flush

• Disassembled front panel and blower access

• Chemically flushed coil and drain outlet

• Removed sludge, dust and fan buildup manually

• Cleaned casing, checked electrical connections, confirmed drain flow

The Result

• Cooling restored to full capacity

• Airflow normalised — quiet and even

• Drain cleared, smell eliminated

• Customer advised on future service interval and signs to watch for

What Could’ve Gone Wrong

• Coil and blower choking would continue, causing further cooling loss

• Drain blockage could lead to internal leakage or water damage

• Dust and microbial buildup could worsen indoor air quality

• Motor strain from restricted airflow could burn out the fan or blower capacitor

What This Case Shows

Just because it runs, doesn’t mean it’s clean.

Casement units are often forgotten — but they choke up just like any split system.

This one ran for years without proper servicing. A clean faceplate hides what’s building up inside.