Midea Aircon Blinking Light Patterns

Reference table for common Midea blink patterns. Use this to identify likely fault classes and narrow what to check next.

Before you use this tool

This is a blink-pattern guidance table, not a model-exact diagnosis. Pattern meaning can vary by controller and series. If your controller shows a direct code (for example `CH21`, `U4`, `E6`), use the error-code guide for a faster match.

Safety warning

Stop using the unit and contact a technician if the breaker trips repeatedly, you smell burning, see sparks, hear loud electrical buzzing, or water is leaking from places it normally should not.

Midea pattern table

Includes common SG residential blinking-light patterns with likely fault classes and typical causes.

Continuous or repeating blink

Green lamp blinks repeatedly for minor airflow/efficiency alerts

Green blink pattern described as minor issue warning on SG source

Details

Pattern ID: GREEN_BLINK_MINOR_AIRFLOW

Pattern type: Persistent blink

Category: Indoor

Indicator: Indoor unit

LEDs: GREEN

Typical causes

Dirty air filters
Temporary indoor-outdoor communication glitch
Reduced cooling efficiency state

Blink count: 1

Operation lamp flashes 1 time repeatedly while timer lamp remains off

EEPROM parameter error indication (fixed-speed table)

Details

Pattern ID: OP_LAMP_1_FLASH_E1_EEPROM

Pattern type: Blink count cycle

Blink count: 1

Service code (reference only): E1

Category: System

Indicator: Indoor unit

LEDs: OPERATION

Typical causes

EEPROM parameter corruption
Indoor control memory fault
PCB data-read error

Blink count: 2

Operation lamp flashes 2 times repeatedly while timer lamp remains off

Indoor-outdoor communication fault indication (inverter table)

Details

Pattern ID: OP_LAMP_2_FLASH_E1_COMM

Pattern type: Blink count cycle

Blink count: 2

Service code (reference only): E1

Category: Communication

Indicator: Indoor unit

LEDs: OPERATION

Typical causes

Indoor-outdoor communication loss
Interconnection wiring issue
Indoor or outdoor PCB communication fault

Blink count: 5

Operation lamp flashes 5 times repeatedly while timer lamp remains off

Indoor room temperature sensor (T1) fault indication

Details

Pattern ID: OP_LAMP_5_FLASH_E4_ROOM_SENSOR

Pattern type: Blink count cycle

Blink count: 5

Service code (reference only): E4

Category: Sensor

Indicator: Indoor unit

LEDs: OPERATION

Typical causes

T1 sensor open/short
Sensor wiring/connector fault
Indoor PCB sensor-input issue

Blink count: 6

Operation lamp flashes 6 times repeatedly while timer lamp remains off

Evaporator coil temperature sensor (T2) fault indication

Details

Pattern ID: OP_LAMP_6_FLASH_E5_COIL_SENSOR

Pattern type: Blink count cycle

Blink count: 6

Service code (reference only): E5

Category: Sensor

Indicator: Indoor unit

LEDs: OPERATION

Typical causes

T2 sensor open/short
Sensor harness fault
Indoor control-board input fault

Blink count: 8pauses ~1 second, then repeats

Outdoor module LED5 stays ON while LED4 flashes 8 times, pauses ~1 second, then repeats

Inverter module protection indication on outdoor PCB LEDs

Details

Pattern ID: OUTDOOR_LED4_8_FLASH_XL0

Pattern type: Blink count cycle

Blink count: 8

Service code (reference only): xL0

Category: Inverter

Indicator: Outdoor unit

LEDs: LED4, LED5

Typical causes

Inverter module protection trigger
Outdoor power-stage stress
Drive module abnormality

Blink count: 9pauses ~1 second, then repeats

Outdoor module LED5 stays ON while LED4 flashes 9 times, pauses ~1 second, then repeats

DC bus low-voltage protection indication on outdoor PCB LEDs

Details

Pattern ID: OUTDOOR_LED4_9_FLASH_XL1

Pattern type: Blink count cycle

Blink count: 9

Service code (reference only): xL1

Category: System

Indicator: Outdoor unit

LEDs: LED4, LED5

Typical causes

DC bus low-voltage event
Power supply instability
Outdoor drive/power circuit fault

Blink count: 10pauses ~1 second, then repeats

Outdoor module LED5 stays ON while LED4 flashes 10 times, pauses ~1 second, then repeats

DC bus high-voltage protection indication on outdoor PCB LEDs

Details

Pattern ID: OUTDOOR_LED4_10_FLASH_XL2

Pattern type: Blink count cycle

Blink count: 10

Service code (reference only): xL2

Category: System

Indicator: Outdoor unit

LEDs: LED4, LED5

Typical causes

DC bus over-voltage event
Power surge condition
Outdoor power-stage abnormality

Blink count: 12pauses ~1 second, then repeats

Outdoor module LED5 stays ON while LED4 flashes 12 times, pauses ~1 second, then repeats

MCE/inverter control error indication on outdoor PCB LEDs

Details

Pattern ID: OUTDOOR_LED4_12_FLASH_XL4

Pattern type: Blink count cycle

Blink count: 12

Service code (reference only): xL4

Category: Inverter

Indicator: Outdoor unit

LEDs: LED4, LED5

Typical causes

Inverter control error (MCE)
Drive command/frequency mismatch
Outdoor module control fault

Continuous or repeating blink

Red lamp blinks repeatedly as serious system warning

Red blink pattern described as high-severity fault warning

Details

Pattern ID: RED_BLINK_SERIOUS_FAULT

Pattern type: Persistent blink

Category: System

Indicator: Indoor unit

LEDs: RED

Typical causes

Compressor fault
Overheating/protection trigger
Electrical or wiring fault

Continuous or repeating blink

Yellow/orange lamp blinks repeatedly as maintenance or drainage alert

Drainage/sensor maintenance alert pattern

Details

Pattern ID: YELLOW_ORANGE_BLINK_DRAINAGE

Pattern type: Persistent blink

Category: Indoor

Indicator: Indoor unit

LEDs: YELLOW, ORANGE

Typical causes

Blocked drainpipe
Indoor water leakage path issue
Sensor malfunction

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