Ice Forming on Aircon (Frozen Coil or Pipes) — Causes, Fixes & Cost in KL
Frost or ice builds up on the evaporator coil or the copper pipes, and the unit stops cooling properly.
Estimated professional fix: RM 129–RM 455 depending on the cause
Ice on the coil or the copper pipes is the aircon telling you the coil is running colder than it should — and in a Malaysian climate that is never normal, because the unit is supposed to be removing heat, not freezing the room's humidity onto a tin plate. The chain is usually one of: low refrigerant (a slow leak has dropped the gas charge), a blocked coil or filter that starves the coil of air, a blower fan turning too slowly, or a temperature sensor reading wrong. Each one pulls the coil temperature down until the moisture in the room's air condenses and freezes on it. The unit then stops cooling, drips as the ice melts, and re-freezes when you switch it back on — a loop that will quietly damage the compressor if it runs for weeks.
Common causes
Professional solutions
Safe DIY checks first
- 1Switch the unit off or to fan-only and let it defrost fully — the ice melts in 30–60 minutes and the water that drips is the amount that was frozen
- 2Take out the filter: if it is clogged with dust, clean it — a starved coil is the most common ice cause
- 3Check the drain: if water is backing up into the tray, the drain is blocked and the tray is overflowing
- 4Note where the ice forms: on the first section of pipe near the unit points to low gas; across the whole coil points to airflow
When to call a pro
What affects the cost
A clean and check starts from RM129 and resolves the ice where the cause is a dirty filter or coil. A chemical wash starts from RM156 for heavier buildup. Where the gas charge is low, a leak check plus top-up runs from RM2.50 per PSI, and the leak itself is repaired first — a top-up without finding the leak just buys time. A failing blower motor or temperature sensor is quoted after the cleaning and gas check. The work carries the standard warranty.
How to prevent it
Related service
This problem usually connects to Aircon Service, Repair & Installation. Review service scope, pricing, warranty, and process before booking.
View Aircon Service, Repair & InstallationFAQs
Why is there ice on my aircon?
Ice forms when the coil gets too cold — usually from low gas, a blocked coil, or poor airflow over the coil.
Should I turn the unit off if it's frozen?
Yes. Switch to fan-only or off to let it defrost, then book a service to find and fix the cause.
Does ice damage the aircon?
Over time ice can damage the coil and compressor. It also means the unit is not cooling efficiently.
How much to fix a frozen aircon?
Cleaning starts from RM 129, and gas top-up from RM 2.50 per PSI. A full chemical wash starts from RM 156.