LG MULTIV III Service Manual page 38

Self-diagnosis function
Error
Error type
No.
2001
Pipe detection error
Master
21 ➔ 001
HR: Heat Recovery
■ 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.(220V±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'
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Only for training and service purposes
Error point
After the auto operation,
if the number of the
indoor units detected is
different from the number
communicating indoor
unit
- 38 -
Main reasons
1. HR unit's power cable or communication cable connec-
tion defect
2. After auto-addressing, wrong address setting of the
indoor unit (Defective indoor power / transmission error
and PCB defect)
3. Wrong setting of the HR unit's rotary switch or dip switch
4. HR unit PCB defect
LGE Internal Use Only