Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 219

[ IX Troubleshooting ]
(4) Errors that are not limited to a particular system
Error Code
6607 No ACK abnormality
(Contin-
ued)
Error
Error dis-
source ad-
play
dress
Address -
which
should not
be existed
Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the
transmission. (eg. When the data is transmitted six times in a row with 30 seconds
interval, the error is detected on the transmission side.)
Note: The address/attribute appeared on the display on the remote controller
indicates the controller which did not provide the response (ACK).
Detection
Cause
method
- (1) Although the address of M-NET
remote controller has been
changed after the group is set
using M-NET remote controller,
the indoor unit is keeping the
memory of the previous ad-
dress.The same symptom will
appear for the registration with
SC.
(2) Although the address of LOSS-
NAY has been changed after the
interlock registration of LOSS-
NAY is made using M-NET re-
mote controller, the indoor unit is
keeping the memory of the pre-
vious address.
- 210 -
Check method and remedy
Delete unnecessary information of non-ex-
isting address which some indoor units
have.
Use either of the following two methods for
deletion.
1) Address deletion by M-NET remote
controller
Delete unnecessary address informa-
tion using the manual setting function of
M-NET remote controller. Refer to this
service handbook "4. [2]. Group set-
tings and interlock settings via the ME
remote controller 1. (3) Address dele-
tion".
2) Deletion of connection information of
the heat source unit by the deleting
switch
Note that this switch deletes all the
group information set via M-NET re-
mote controller and all the interlock
information of LOSSNAY and the in-
door unit.
Turn off the power source of the heat
source unit, and wait for 5 minutes.
Turn on the dip switch (SW2-2) on the
heat source unit main board.
Turn on the power source of the heat
source unit, and wait for 5 minutes.
Turn off the power source of the heat
source unit, and wait for 5 minutes.
Turn off the dip switch (SW2-2) on the
heat source unit main board.
Turn on the power source of the heat
source unit.