LG MULTI V Service Manual page 143

n Error diagnosis and countermeasure flow chart
1) Check connection condition of temperature sensor and lead cable
2) Is value of temperature sensor normal? If not replace sensor
- Piping temperature sensor : 10 ℃[50 ℉] = 10 kΩ : 25 ℃[77 ℉] = 5 kΩ : 50 ℃[122 ℉] = 1.8 kΩ
3) If connection of sensor and value is correct, replace outdoor unit PCB
n HR unit error display No.
HR #1 HR #2 HR #3 HR #4
HR Unit
C01 C02
Error display
n Example of HR unit error display.
#16 HR unit Sub-cooling inlet pipe temperature sensor error 200 ➔ C16 (Repeat)
C: HR unit
#: HR unit Nuber
Error No.
Transmission error
204C#HR
between the HR unit
and outdoor unit
HR #5 HR #6 HR #7
C03 C04 C05 C06
Error type
Transmission error between
the HR unit and outdoor unit
HR #8 HR #9 HR #10 HR #11 HR #12 HR #13 HR #14 HR #15 HR#16
C07 C08 C09 C10
Error point
1. Defective connection in HR unit power
supply and communication connection
2. Wrong setting of the HR unit rotary
switch and dip switch
3. Defective HR unit PCB
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Self-diagnosis function
C11 C12 C13 C14
Main reasons
C15 C16