Aircon Components Guide: Learn How it Works
- thesnowflakesg
- May 8
- 10 min read
Updated: May 26
Your aircon doesn’t fail because it’s dirty. It fails because one part stops doing its job.
One symptom can point to multiple root faults. This guide breaks down the essential components inside every split-system unit — what they do, how they fail, and what we check during a proper diagnostic.
(Click on the arrow to expand the points)
Cooling Circuit
Parts that generate and move cold air:
Compressor – The engine that drives cooling
Condenser Coil – Where heat exits the system
Evaporator Coil – Where warm air becomes cold
Expansion Valve – Controls refrigerant flow into the coil
Copper Pipes – Carry refrigerant between indoor and outdoor units
Refrigerant Gas – The chemical that carries heat
Airflow System
Parts that push cooled air into the room:
Blower Fan – Pushes cooled air into the room
Blower Motor – Powers the indoor airflow
Filters – First line of defence against dust
Control & Electronics
Parts that regulate temperature, logic, and timing:
Thermistor – Temperature sensor that controls cooling logic
Sensor Receiver – Takes commands from your remote
PCB (Printed Circuit Board) – The brain of the system
Drainage & Hygiene
Parts that manage water and prevent leaks:
Drain Pan – Collects and channels condensation
Drain Pipe – Carries condensation safely out
Final Close
Every symptom points to a component. We test the system — not just clean it — and fix what’s actually failing.
No guesswork. No pressure. Just real answers.