Mitsubishi Electric PQHY-P120THMU-A, Service Handbook

Page: 286 / 414

[
IX
Troubleshooting ]
- 277 - HWE09080 GB
1. Error Code
No ACK error
2. 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 trans-
mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(4) Errors that are not limited to a particular system
6607
Error
source ad-
dress
Error dis-
play
Detection
method
Cause Check method and remedy
Address
which
should not
be existed - - (1) Although the address of ME
remote controller has been
changed after the group is set
using ME remote controller,
the indoor unit is keeping the
memory of the previous ad-
dress. The same symptom will
appear for the registration with
SC. Delete unnecessary informa-
tion of non-existing address
which some indoor units have.
Use either of the following two
methods for deletion.
(2) Although the address of
LOSSNAY has been changed
after the interlock registration
of LOSSNAY is made using
ME remote controller, the in-
door unit is keeping the mem-
ory of the previous address. 1) Address deletion by ME remote
controller
Delete unnecessary address in-
formation using the manual set-
ting function of ME remote
controller. Refer to this service
handbook "IV [2] Group Set-
tings and Interlock Settings via
the ME Remote Controller 1. (3)
Address deletion."(page 98)
2) Deletion of connection informa-
tion of the heat source unit by
the deleting switch
Note that this switch deletes
all the group information set
via ME remote controller and
all the interlock information
of LOSSNAY and the indoor
unit.
Œ
Turn off the power source of
the heat source unit, and wait
for 5 minutes.
Œ
Turn on the dip switch (SW2-
2) on the heat source unit
control board.
Œ
Turn on the power source of
the heat source unit, and wait
for 5 minutes.
Œ
Turn off the power source of
the heat source unit, and wait
for 5 minutes.
Œ
Turn off the dip switch (SW2-
2) on the heat source unit
control board.
Œ
Turn on the power source of
the heat source unit.