Panasonic Aircon Blinking Light Patterns

Reference table for common Panasonic 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.

Panasonic pattern table

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

Continuous or repeating blink

Green lamp blinks repeatedly during minor airflow/filter/system issues

Green blink pattern described as minor airflow/filter-related warning on SG service source

Details

Pattern ID: GREEN_BLINK_MINOR_AIRFLOW

Pattern type: Persistent blink

Category: Indoor

Indicator: Indoor unit

LEDs: GREEN

Typical causes

Dirty/clogged filters
Temporary control glitch
Minor indoor-outdoor communication instability

No active blink pattern

No active TIMER-lamp blinking while protective code H98 is stored in memory

Some protective events are stored without active blink indication

Details

Pattern ID: NO_TIMER_BLINK_H98_STORED

Pattern type: No active blink

Service code (reference only): H98

Category: System

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Indoor high-pressure protection event
Temporary operating condition that triggered protection
Historical fault memory retained after event

No active blink pattern

No active TIMER-lamp blinking while protective code H99 is stored in memory

Indoor freeze-prevention protection can be logged without active blink

Details

Pattern ID: NO_TIMER_BLINK_H99_STORED

Pattern type: No active blink

Service code (reference only): H99

Category: System

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Freeze-prevention protection event
Low indoor pipe temperature during cooling/soft dry
Historical fault memory retained after event

Continuous or repeating blink

Red lamp blinks repeatedly as a serious fault warning

Red blink pattern described as high-severity fault alert on SG source

Details

Pattern ID: RED_BLINK_SERIOUS_FAULT

Pattern type: Persistent blink

Category: System

Indicator: Indoor unit

LEDs: RED

Typical causes

Refrigerant-side fault
Compressor malfunction or overheat condition
Electrical/PCB fault

Continuous or repeating blink

Timer LED blinks continuously after the unit stops due to abnormality

Panasonic self-diagnosis fault indication via TIMER lamp

Details

Pattern ID: TIMER_LED_BLINK_GENERAL_FAULT

Pattern type: Persistent blink

Category: System

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Protection logic detected abnormal operation
Stored fault condition in control memory
Indoor or outdoor abnormality requiring code readout

Run remote self-check

TIMER lamp blinking and remote self-check returns H11

Indoor-outdoor communication abnormality indication

Details

Pattern ID: TIMER_LED_BLINK_H11

Pattern type: Code-check flow

Blink count: 11

Service code (reference only): H11

Category: Communication

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Indoor-outdoor signal transmission fault
Interconnection wiring issue
Indoor or outdoor PCB fault

Run remote self-check

TIMER lamp blinking and remote self-check returns H14

Indoor intake air temperature sensor abnormality indication

Details

Pattern ID: TIMER_LED_BLINK_H14

Pattern type: Code-check flow

Blink count: 14

Service code (reference only): H14

Category: Sensor

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Indoor intake sensor open/short
Sensor connector poor contact
Indoor PCB sensor reading fault

Blink count: 19

TIMER lamp blinking and error table indicates H19

Indoor fan motor/indoor PCB trouble indication

Details

Pattern ID: TIMER_LED_BLINK_H19

Pattern type: Blink count cycle

Blink count: 19

Service code (reference only): H19

Category: Indoor

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Indoor fan motor lock
Indoor fan wiring/terminal issue
Indoor PCB drive fault

Continuous or repeating blink

TIMER lamp blinking and code history indicates H97 event

Outdoor fan motor lock abnormality indication

Details

Pattern ID: TIMER_LED_BLINK_H97

Pattern type: Persistent blink

Service code (reference only): H97

Category: Outdoor

Indicator: Indoor unit

LEDs: TIMER

Typical causes

Outdoor fan DC motor lock
Outdoor fan winding/electrical fault
Outdoor PCB drive issue

Continuous or repeating blink

Yellow/orange lamp blinks repeatedly as maintenance/drainage alert

Drainage or maintenance alert pattern on SG Panasonic blinking-light guide

Details

Pattern ID: YELLOW_ORANGE_BLINK_DRAINAGE

Pattern type: Persistent blink

Category: Indoor

Indicator: Indoor unit

LEDs: YELLOW, ORANGE

Typical causes

Blocked drainpipe
Water leakage inside indoor unit
Sensor communication issue

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