OCH791 _63
6607 (A7): No ACK error
Chart 4 of 4
Diagnosis of failure
When operating in different refrigerant systems
(2 or more outdoor units), check if any of the
indoor unit stores non-existing address informa-
tion.
Replace the controller board which the displayed
address/attribute belongs to.
Continued from the previous page.
Defective outdoor multi controller circuit board
(repeater circuit) on the outdoor unit is suspect
-
ed.
Replace the outdoor multi controller circuit board
one by one, then check for normal operation.
Delete the unnecessary address using a manual
setting function on the remote controller
(Only for the system to which the Fresh Master/
Lossnay is connected or the system in which a
group setting involving different refrigerant
systems is made).
When operating in a single refrigerant system
(single indoor unit), the controller of the dis
-
played address/attribute is defective.
Apply the correct kind of transmission line, then
perform the procedure 1.
Complete.
Check the wiring.
Connect the wiring properly.
Is the correct kind of transmission line
used?
Is it operating different refrigerant
systems?
Is the address information correct?
Is the wiring on the circuit board
connected properly?
Does it operate normally?
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
