40
LG
LG air conditioner error 40
Meaning
CT Circuit
General meaning for the brand's models, unless a model's own manual says otherwise.
Meaning
Current transformer (CT) thermistor has disconnected or has shorted out
Models
LS091HSV, LS121HSV
How the unit shows it
- No. of Times Indoor Unit LEDs Blink LED1 (Heating LED): 4X
- No. of Times Outdoor Unit PCB LEDs Blink LED1 (Green): 4X
- LED01G (Red): 4 times
Causes and how to check
- 1 possible causes
- the cited manual page, and follow-up questions
No account needed to look up codes.
Model series: LS
Guides
- Checking an air conditioner temperature sensor (thermistor)
How to check the room, coil or discharge sensor when the unit reports a sensor error: measure its resistance and compare with the exact model's table.