Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 92

Check code
6607
(A7)
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page
Is the correct kind of transmission
line used?
Is it operating in multi refrigerant
system?
When operating in a multi refrigerant system (2 or
more outdoor units), check if any of the indoor unit
stores non-existing address information.
Is the address information correct?
Replace the controller board which the
displayed address/attribute belongs to.
Does it operate normally?
OCH632A
Diagnosis
Yes
Yes
Yes
Yes
No ACK error
Apply the correct kind of transmission line,
No
then perform the procedure 1.
When operating in a single refrigerant
system (single indoor unit), the controller of
No
the displayed address/attribute is defective.
Delete the unnecessary address using
a manual setting function on the remote
No
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).
Defective outdoor multi controller circuit board
(repeater circuit) on the outdoor unit is suspected.
No
Replace the outdoor multi controller circuit board one
by one, then check for normal operation.
92
Chart 4 of 4
Remedy
Complete