1. Filter reminder
Many units remind you to clean the filter after a set number of hours.
How we fix itFree: clean filter, reset the light
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Aircon Blinking Light: What Does It Mean?
A blinking light can be harmless or a sign of a fault. Here's how to tell the difference, and what to do next.
The short answer
A blinking light is usually a filter reminder, a timer indicator, or an error code from the unit's self-check. The meaning depends on your brand and model. Reset the power first. If it keeps blinking and won't cool, it needs a technician to read the error.
Quick diagnosis: what is your aircon doing?
| What you notice | Likely cause | Fix | Cost |
|---|---|---|---|
| Filter or "clean" light on | Filter reminder | Clean filter, reset the light | Free |
| Timer light blinking | Timer set, or error on some brands | Check your user manual | Free |
| Blinking after a power cut | Unit restarting | Wait, or reset the power | Free |
| Blinking and won't run | Error code from a fault | Diagnosis and repair | $80 diagnosis* |
| Blinking with a water leak | Drain safety cut-off | Servicing and drain flush | from $54.50 |
Prices before GST. *On-site diagnosis is $80 for a split system and is waived when you book the repair.
5 reasons your aircon light is blinking, and how to fix each
2. Needs a power reset
After a power cut or surge, some units blink until they're reset.
How we fix itFree: reset at the isolator
3. Sensor fault
A faulty temperature sensor sends wrong readings and triggers an error.
How we fix itSensor check and replacementAircon repair: $80 diagnosis →
4. Drain safety cut-off
If the drain tray is full, some units stop and blink to prevent overflow.
How we fix itDrain tray and pipe flushingAircon servicing from $54.50 →
5. Control board or compressor error
More serious faults show as specific blink patterns that a technician can read.
How we fix itDiagnosis and repairAircon repair: $80 diagnosis →
What you can check yourself
- Count the blinks and note which light is blinking.
- Check your user manual for the code.
- Switch off at the isolator for 5 minutes, then on again.
- Clean the filter and reset the filter light.
- Record a video of the blinking to send us.
If the unit keeps blinking after a reset, don't keep restarting it. Let a technician check it.
Aircon blinking light: FAQs
How much does it cost to fix an aircon blinking light?
Many blinking lights are free to fix with a reset or filter clean. If there's a fault, JL Aircond's on-site diagnosis is $80 for a split system, waived if you book the repair.
How do I reset my aircon blinking light?
Switch the aircon off at the isolator, wait about 5 minutes, then switch it back on. For a filter light, clean the filter and press the filter reset button.
Can I still use my aircon with a blinking light?
If it's a filter or timer light, yes. If it blinks and won't cool or leaks, switch it off and get it checked.
Do you service all aircon brands?
Yes. We work on all major aircon brands. Send us your brand and model on WhatsApp.
Light still blinking? We'll read the error.
Send us a video of the blinking light and your aircon brand on WhatsApp. We'll tell you what it means.