Reference table for common Mitsubishi Electric (Starmex) blink patterns. Use this to identify likely fault classes and narrow what to check next.
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.
Includes common SG residential blinking-light patterns with likely fault classes and typical causes.
Room temperature thermistor abnormality indication
Pattern ID: OP_LAMP_1_FLASH_P1
Pattern type: Blink count cycle
Blink count: 1
Service code (reference only): P1
Category: Sensor
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Indoor coil thermistor abnormality indication
Pattern ID: OP_LAMP_2_FLASH_P2
Pattern type: Blink count cycle
Blink count: 2
Service code (reference only): P2
Category: Sensor
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Serial-signal abnormality indication
Pattern ID: OP_LAMP_3_FLASH_E6
Pattern type: Blink count cycle
Blink count: 3
Service code (reference only): E6
Category: Communication
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Indoor fan motor / indoor control system abnormality indication
Pattern ID: OP_LAMP_4_FLASH_FB
Pattern type: Blink count cycle
Blink count: 4
Service code (reference only): Fb
Category: Indoor
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Outdoor thermistor abnormality indication
Pattern ID: OP_LAMP_6_FLASH_U4
Pattern type: Blink count cycle
Blink count: 6
Service code (reference only): U4
Category: Sensor
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Indoor-outdoor receiving/communication fault indication
Pattern ID: OP_LAMP_7_FLASH_E8
Pattern type: Blink count cycle
Blink count: 7
Service code (reference only): E8
Category: Communication
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Indoor fan rotation feedback missing indication
Pattern ID: OP_LAMP_11_FLASH_PB
Pattern type: Blink count cycle
Blink count: 11
Service code (reference only): Pb
Category: Indoor
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Refrigerant circuit abnormality indication
Pattern ID: OP_LAMP_14_FLASH_PL
Pattern type: Blink count cycle
Blink count: 14
Service code (reference only): PL
Category: System
Indicator: Indoor unit
LEDs: OPERATION
Typical causes
Remote-assisted code retrieval during blinking-lamp faults
Pattern ID: REMOTE_CHECK_WHILE_OP_BLINKS
Pattern type: Code-check flow
Category: General
Indicator: Remote
LEDs: DISPLAY
Typical causes
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