Check code
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
6607
(A7)
No ACK error
Diagnosis
Remedy
Chart 4 of 4
Yes
Yes
Yes
Yes
No
No
No
No
80
OCH634C
Is the correct kind of transmission
line used?
Is it operating in multi refrigerant
system?
Is the address information correct?
Does it operate normally?
When operating in a multi refrigerant system (2 or
more outdoor units), check if any of the indoor unit
stores non-existing address information.
Replace the controller board which the
displayed address/attribute belongs to.
Continued from the previous page.
Defective outdoor controller board (repeater circuit)
on the outdoor unit is suspected.
Replace the outdoor controller board one by one,
then check for normal operation.
Delete the unnecessary address using
a manual setting function on the remote
controller
(Only for operating in a system with the
Fresh Master/Lossnay is connected, or in a
multi refrigerant system with group setting
is set).
When operating in a single refrigerant
system (single indoor unit), the controller of
the displayed address/attribute is defective.
Apply the correct kind of transmission line,
then perform the procedure 1.
Complete.
