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Only for training and service purposes
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Self-diagnosis function
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
Error No. Error type Error point Main reasons
Transmission error between
the HR unit and outdoor unit
Transmission error
between the HR unit
and outdoor unit
204C#HR
■ Error diagnosis and countermeasure flow chart
1) Check connection between power cables and communication cables, check communication green LED blink of
HR unit PCB
2) If communication green LED blink of HR unit PCB is normal, check setting of rotary switch of HR unit and dip
switch(Refer to CH200),
Reset power of outdoor and HR unit
(If communication error of HR unit occurs, it can’t be released until reset of outdoor power)
3) If communication green LED blink of HR unit PCB is abnormal(not blinking,just on), check communication con-
dition of total indoor units(Refer to CH05)
If communication green LED blink of HR unit PCB is abnormal(not blinking, just on) even if communication con-
dition is normal, replace HR unit PCB
[NB] If Indoor units/communication cables of HR unit and cables of power 220V has been changed each other,
communication parts and indoor will be burnt
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