Fault diagnosis and Trouble shooting guide
Title
Display
code
Cause of errorMeaning
Confirm the state of sensor connection
to the PCB
No
Plug the sensor to
normal position
Check indoor unit
PCB
No
Replace sensor
which is
corresponded
Is the state of sensor
connection normal?
Is the value of Sensor
resistance/voltage
normal?
•• Refer to value table of temperature-resistance in appendix
•• Refer to value table of pressure-voltage in appendix
Yes
Yes
Sensor
error
40, 41,
42, 43,
44, 45,
46, 47,
48, 49
•The temperature sensor is unplugged
•The sensor is open or short by its inferiority
•PCB inferiority
Sensor detects abnormal
value
Trouble shooting Flow
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