LG MULTI V Service Manual page 142

Self-diagnosis function
n Error diagnosis and countermeasure flow chart
1) Check the periodic blinking of the HR unit's green LED (transmission LED)
2) When green LED (communication LED) of HR unit blinks regularly,
2.1) Check input power of HR unit.(220 V±10 %)
2.2) After reset of power of outdoor, wait for more than 30 minutes, temperature of pipes will be cool down then,
do auto-addressing
2.2) While power of HR unit is on, check total indoors display 'CH05' or not.(Refer to CH05)
3) When green LED (communication LED) of HR unit blinks regularly, Check setting of rotary switch and dip
switch, After reset of power of outdoor and HR unit, wait for more than 30 minutes, temperature of pipes will be
cool dow then, do auto-addressing *
4) If indoor unit quantity is different between installed quantity and quantity which check thru piping searching,
check pipe installation condition
Outdoor unit ↔ HR unit ↔ Indoor unit
5) If indoor unit has not been connected to #1 valve of HR unit, set pipes of HR unit manually**
6) If it is not applied as above, set pipes of HR unit as manual
[NB] How to check display method of outdoor main PCB 7-segment ?:
'88' ➔ Indoor qty which check thru 'Auto-Addressing' ➔ '88' ➔ Indoor qty which check thru 'piping checking'
Error No.
HR unit liquid pipe tem-
201C#HR
perature sensor error
Error No.
HR unit
Sub-cooling inlet pipe
202C#HR
temperature sensor
error
Error No.
HR unit
Sub-cooling discharge
203C#HR
pipe temperature sensor
error
Error type
Abnormal value of sensor
measurement (Open / Short)
Error type
Abnormal value of sensor
measurement(Open / Short )
Error type
Abnormal value of sensor
measurement(Open / Short)
Error point
• Defective temperature sensor connection
• Defective temperature sensor
(Open/Short)
• Defective outdoor unit PCB
Error point
• Defective temperature sensor connection
• Defective temperature sensor
(Open/Short)
• Defective outdoor unit PCB
Error point
• Defective temperature sensor connection
• Defective temperature sensor
(Open/Short)
• Defective outdoor unit PCB
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Main reasons
Main reasons
Main reasons