LG MULTI V Service Manual page 141

* Measure the resistance of 4way valve
** Confirm the 4way valve coil is inserted to the end
Error
Error type
No.
2001 Pipe detection error
HR: Heat Recovery
Error point
After the auto operation,
if the number of the
indoor units detected is
different from the number
communicating indoor
unit
- 141 -
Location of 4way valve connector on
Main PCB(marked as 4way,CN09)
**** Check the output voltage of terminal socket
during heating operation
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
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Self-diagnosis function