What Is an Aircon Chemical Overhaul and How Does It Work?

We understand the frustration of switching on your aircon during a sweltering Singapore afternoon only to get weak, lukewarm air.

Established in 2016 by James Tan and Sandra Lim, iCare Aircon has rescued thousands of failing cooling systems across local HDBs and commercial spaces. A superficial clean rarely solves a deeply clogged fan coil.

Our comprehensive approach guarantees a return to factory-fresh cooling performance.

This guide forms a core part of our Aircon Chemical Overhaul coverage at iCare. Let’s examine exactly what happens during this intensive service and how it protects your monthly SP Group bill.

So, exactly what is aircon chemical overhaul and why do you need it?

Plain definition; difference from chemical wash

An aircon chemical overhaul is a complete dismantling of your fan coil unit, followed by a deep chemical soak of the individual parts. A standard chemical wash only sprays cleaning solutions onto the unit while it remains attached to your wall.

This fundamental difference makes the overhaul a much more intensive and effective solution.

We find that wall-mounted washes often push dirt deeper into the drainage pan.

Leaving that sludge behind causes the dreaded leaking aircon problem so common in Singapore homes. The National Environment Agency notes that heavily soiled air conditioners can draw up to 20% more electricity to cool a room.

Our technicians strongly recommend the full dismantle process if your unit has not been serviced in over a year.

Here is a clear breakdown of the two services side-by-side:

Feature	Chemical Wash	Chemical Overhaul
Dismantling	Partial (Cover only)	Full (Entire indoor unit removed)
Cleaning Method	Sprayed directly on the wall	Parts soaked in a chemical bath
Best For	Routine maintenance	Severe clogs, persistent leaks, and foul odors
Energy Impact	Minor efficiency boost	Restores factory-level airflow

Full dismantle steps

The full aircon dismantle clean begins by pumping down the refrigerant and safely disconnecting the indoor unit from your wall. Technicians then strip the system down to its core components, isolating the evaporator coil, blower wheel, and drainage pan.

We start the chemical overhaul process by removing the electronic circuit boards to prevent any water damage.

Every non-electrical part then goes straight into a specialized alkaline bath. This soaking process dissolves hardened jelly and bacterial biofilms that a standard brush simply cannot reach.

Our team uses a specialized alkaline-based chemical rather than highly corrosive acidic solutions.

Acids can heavily damage the sensitive aluminum cooling fins over time, reducing the lifespan of top brands like Daikin and Mitsubishi. A proper teardown includes several critical phases to ensure nothing gets missed.

The primary dismantle and cleaning sequence includes:

• Refrigerant isolation: Safely locking the cooling gas back into the outdoor compressor unit.
• Electronic component removal: Detaching all sensitive PCBs and internal sensors.
• Deep chemical soaking: Submerging the dirty evaporator coil in a strong alkaline solution.
• High-pressure flushing: Washing away all dissolved debris with pure water to stop the chemical reaction.

Fan motor inspection, bearing lubrication

This critical step involves checking the blower fan motor for wear and applying fresh lubrication to the internal bearings. Proper lubrication stops the annoying rattling noises that often disrupt sleep in quiet HDB bedrooms.

We inspect the motor shaft carefully because accumulated dust places immense strain on the moving parts.

A clogged, heavy blower wheel forces the motor to run hotter and work much harder than designed. Over time, this excess friction degrades the motor bearings entirely.

Our technicians replace the dried-out grease with premium industrial lubricants to ensure a smooth, silent spin.

Ignoring this step often leads to premature motor failure, which costs significantly more to fix than a routine service. In Singapore’s high humidity, preventative maintenance of these metal components stops rust dead in its tracks.

For a related deep-dive, see our guide on Aircon Chemical Overhaul vs Chemical Wash: Which Do You Need?.

Reassembly with new gaskets

The final reassembly process pairs the freshly cleaned parts with brand-new rubber gaskets to guarantee a watertight seal. Replacing these degraded seals is the absolute best defense against indoor condensation drips and refrigerant gas leaks.

We never reuse old, hardened O-rings when putting your fan coil unit back together.

The constant temperature changes inside an aircon cause original rubber seals to become brittle and crack within a few years. A cracked gasket is the hidden culprit behind many unexplained water leaks in local homes.

Our supply kits always stock exact-match replacement gaskets for all major brands operating in the region.

Fitting these fresh seals restores the factory-grade vacuum pressure required for efficient cooling. Once everything is bolted back together, the system is vacuumed and tested to ensure zero leaks.

A proper reassembly sequence protects your investment through:

• Component alignment: Ensuring the blower wheel sits perfectly balanced to avoid harsh vibrations.
• Watertight sealing: Applying fresh rubber gaskets to all critical pipe joints.
• Gas pressure testing: Verifying the refrigerant levels match the manufacturer’s exact specifications.
• Drainage confirmation: Pouring water through the newly cleared pan to ensure rapid flow.

Typical 3-4 hours per unit

A professional aircon chemical overhaul generally takes between three and four hours to complete for a single wall-mounted unit. This exact timeframe reflects the careful attention required to dismantle, soak, dry, and correctly reassemble every single component.

We schedule these intensive sessions knowing that rushing the chemical soak will leave deep-seated mould behind.

A standard servicing might wrap up in just 45 minutes, but an intensive cleaning requires patience. The chemical solution needs at least 20 to 30 minutes just to properly break down the calcified dirt on the coil.

Our scheduling team always blocks out a full half-day for households with multiple units requiring this treatment.

Drying the electrical components thoroughly before reassembly is non-negotiable for your family’s safety. Any lingering moisture near the circuit boards could trigger a dangerous short circuit when the power is restored.

Pro-Tip: Plan for some moderate noise during the first and last 30 minutes of the service. The dismantling and reassembly phases involve power tools and heavy equipment, so it is best to avoid scheduling this during a baby’s nap time or an important meeting.

Ready to Book?

If you are ready to resolve your cooling issues, the fastest path is securing a fixed quote directly from our team. Just call +65 3138 2108, message us on WhatsApp, or use the booking form on our contact page.

We provide transparent pricing upfront so you know exactly what to expect before any tools come out.

Regular maintenance pays for itself by preventing costly hardware failures down the line. Do not let a minor blockage turn into an expensive compressor replacement.

For more specific details on the chemical overhaul process itself, please explore our comprehensive Aircon Chemical Overhaul guide.