Why Is My Aircon Light Blinking? Here’s What It Means and What You Should Do

If your aircon light suddenly starts blinking, it’s usually a sign that something’s not quite right. While it might be tempting to ignore it, that little flashing light is your unit’s way of saying: “Hey, I need some attention!” Here’s a breakdown of the most common reasons your aircon light might be blinking—and what you can do about it.

1. Power Supply Issues

A blinking light can sometimes mean there’s a power supply problem. Maybe the voltage is unstable, or there was a recent blackout or surge that disrupted your system. Try turning the unit off for a few minutes and turning it back on. If the light keeps blinking, it’s time to call in a professional.

2. Dirty Air Filters or Coils

Blocked filters or dirty coils reduce airflow, causing your system to overheat or shut down. Some models blink to indicate reduced performance or overheating due to this issue. Check and clean your filters regularly to avoid this!

3. Sensor or Temperature Error

Many modern units come with sensors to detect temperature and airflow. If these sensors fail or get knocked out of place, the unit might blink to warn you. You may also notice the room isn’t cooling evenly.

4. Drainage Problems

If your aircon can’t drain water properly, it might blink to indicate a clog in the drainage pipe. This can lead to leaking or even mold growth—so don’t ignore it.

5. System or Internal Fault

Sometimes, blinking lights indicate a deeper technical issue—like a faulty PCB (printed circuit board), motor malfunction, or refrigerant leak. These will need a technician to diagnose and fix.

Pro Tip: Don’t Ignore the Blink!

Your aircon isn’t just being annoying. That blinking light is a smart warning system. The longer you wait, the higher the risk of bigger (and more expensive) damage.

📞 Need Help?

If you’re in doubt, our expert technicians are just a call away. We offer fast, affordable inspections and repairs—so your aircon is back to cool and quiet in no time.
+65 8846 0618/ 8846 0628