AC Blinking Light Error: Quick Answer
When the LED on your AC’s indoor or outdoor unit starts blinking, it is communicating a fault code. The blink pattern — how many times it flashes before a pause — indicates a specific error. This guide covers blink code meanings for Samsung, LG, Daikin, and Voltas ACs so you can diagnose the problem quickly.
Why Is My AC Light Blinking?
Most split AC brands use the indoor unit’s operation LED (often green or orange) to flash fault codes when no display screen is available, or in addition to the display. The pattern works like Morse code: count the number of flashes before a pause, and that number maps to a specific error.
Samsung AC Blinking Light Codes
| Blink Pattern | Meaning | Fix |
|---|---|---|
| 1 blink | Indoor unit PCB fault | Power cycle; technician check if persistent |
| 4 blinks | High pressure protection | Clean outdoor condenser coil |
| 5 blinks | Low pressure / refrigerant leak | Call technician; do not run the AC |
| 6 blinks | Communication error | Power cycle both units; check inter-unit wiring |
LG AC Blinking Light Codes
| Blink Pattern | Meaning | Fix |
|---|---|---|
| 1 blink | Indoor room temperature sensor (CH01) | Replace indoor temperature sensor |
| 2 blinks | Indoor pipe sensor (CH02) | Replace indoor pipe sensor |
| 5 blinks | Communication error (CH05) | Power cycle; check inter-unit signal cable |
| 10 blinks | Indoor fan motor (CH10) | Check fan obstruction; replace motor |
Daikin AC Blinking Light Codes
| Blink Pattern | Meaning | Fix |
|---|---|---|
| Operation light ON + Timer blinking | Malfunction detected | Count timer blinks to identify the error code |
| 3 blinks | High pressure fault (E3) | Clean outdoor unit; check refrigerant |
| 4 blinks | Communication error (U4) | Power cycle; check inter-unit wiring |
| 5 blinks | Coil freeze / anti-frost (A5) | Clean filter; run fan mode to thaw coil |
Voltas AC Blinking Light Codes
| Blink Pattern | Meaning | Fix |
|---|---|---|
| 1 blink | High pressure protection (E1) | Clean outdoor unit condenser coil |
| 2 blinks | Anti-freezing protection (E2) | Clean filter; run fan mode to thaw |
| 3 blinks | Low pressure / refrigerant (E3) | Call technician for refrigerant check |
| 6 blinks | Communication error (E6) | Power cycle; check inter-unit wiring |
How to Count AC Blink Codes Correctly
- Watch the LED closely and count each flash before it pauses.
- The number of flashes before the pause is the error number.
- Some brands use two-part codes — count the first sequence, pause, then count the second.
- Take a video on your phone so you can count accurately.
When to Call a Technician
- Blink code indicates low pressure / refrigerant leak — professional repair needed.
- Blink code indicates compressor or PCB fault.
- Blinking does not stop after a full power reset.
- You cannot match the blink pattern to a code in this guide.
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