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Self-diagnosis function
Location of 4way valve connector on
Main PCB(marked as 4way,CN09)
** Confirm the 4way valve coil is inserted to the end
* Measure the resistance of 4way valve
**** Check the output voltage of terminal socket
during heating operation
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
Error
No.
Error type Error point Main reasons
After the auto operation,
if the number of the
indoor units detected is
different from the number
communicating indoor
unit
Pipe detection error2001
HR: Heat Recovery
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