Your aircon is blinking at you like it’s trying to send a message in Morse code. In a way, it is. A blinking light usually means the unit has detected a problem and stopped itself to avoid damage.
Quick checks you can safely do first
- Remote batteries. Swap them. You’d be surprised.
- Power. Check the isolator switch and your circuit breaker.
- Reset. Switch off at the isolator, wait 5 minutes, then switch back on. Some minor glitches clear this way.
- Filters. Very dirty filters can trigger a protective shutdown on some models.
If it blinks again after a reset, stop there. Repeated restarts won’t fix a real fault.
Common causes behind a blinking light
- Sensor or thermistor fault: the unit can’t read the temperature properly.
- Circuit board (PCB) problem: often after a power surge.
- Fan motor issue: the indoor or outdoor fan isn’t spinning as it should.
- Drain or water level problem: on some units, a full tray triggers a stop.
- Communication error between the indoor and outdoor unit, often wiring.
What about error codes?
Many aircons show a code like E1, F3 or a pattern of blinks. The meaning differs between brands and models, so take a photo of the code and the model number on the sticker. That helps a technician diagnose much faster.
How we handle repairs
We find the actual cause first, then quote before we fix anything. No guessing, no replacing parts “just in case”. Most common faults are covered on our aircon repair page.
If the unit is simply overdue, start with aircon servicing. If the fault stays, we will talk repair.
Aircon blinking right now? WhatsApp us a photo of the blinking light and the model sticker.