Upper lamp blinks 9 times - Other abnormality detected

What does 9-time blink (2.5-second OFF) mean?

The upper operation indicator lamp blinks nine times with a 2.5-second pause. This general error code indicates an abnormality not covered by other specific codes, often related to indoor thermistors.

• Indoor thermistor abnormality (e.g., defrost or ambient)
• Other unspecified system fault
• Potential refrigerant circuit issue

Click steps to track your progress.

1. 1

   Check the stop valve and the 4-way valve.

2. 2

   Refer to 'TEST POINT DIAGRAM AND VOLTAGE' in the service manual for thermistor characteristics.

3. 3

   Thoroughly check the outdoor unit failure mode recall function for more details.