Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 268

-
(2) Grouping of units in a system with multiple outdoor units
Error Code
6607 No ACK abnormality
(Contin-
ued)
Error
Error dis-
source ad-
play
dress
Outdoor M-NET re-
mote control-
unit
ler (RC)
(OC)
MA remote
controller
(MA)
Indoor M-NET re-
unit mote con-
(IC) troller (RC)
MA remote
controller
(MA)
LOSSNAY M-NET re-
(LC) mote con-
troller (RC)
MA remote
controller
(MA)
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
No ac- Same cause as that for system with
knowledge-
one outdoor unit
ment (ACK)
at IC trans-
mission to
OC
No ac- (1) Same causes as (1) - (5) for system
with one outdoor unit
knowl-
(2) Disconnection or short circuit of the
edgement
transmission line for the outdoor unit
(ACK) at
on the terminal block for centralized
RC trans-
control line connection (TB7)
mission to
(3) When multiple outdoor units are con-
IC
nected and the power source of one of
the outdoor units has been shut off.
(4) The male power supply connector of
the outdoor unit is not connected to the
female power supply switch connector
(CN40).
(5) The male power supply connectors on
2 or more outdoor units are connected
to the female power supply switch con-
nector (CN40) for centralized control.
If an error occurs, after the unit runs normal-
ly once, the following causes may be consid-
ered.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connected
units (7102)
Address setting error (7105)
No ac- (1) Same causes as (1) - (5) for system
with one outdoor unit
knowl-
(Interlocked operation between LOSS-
edgement
NAY and the indoor units in the system
(ACK) at IC
in which the indoor units connected to
transmis-
different outdoor units are grouped)
sion to LC
(2) Disconnection or short circuit of the
transmission line for the outdoor unit
on the terminal block for centralized
control line connection (TB7)
(3) When multiple outdoor units are con-
nected and the power source of one of
the outdoor units has been shut off.
(4) The male power supply connector of
the outdoor unit is not connected to the
female power supply switch connector
(CN40).
(5) The male power supply connectors on
2 or more outdoor units are connected
to the female power supply switch con-
nector (CN40) for centralized control.
If an error occurs, after the unit runs
normally once, the following causes
may be considered.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connected
units (7102)
Address setting error (7105)
- 259 -
[ IX Troubleshooting ]
Check method and remedy
Same remedy as that for system with one
outdoor unit
1) Turn off the power sources of the out-
door and indoor units for 5 or more min-
utes, and turn them on again. If the error
is accidental, the will run normally.If not,
check the cause 2).
2) Check the causes of (1) - (5). If the
cause is found, correct it. If no cause is
found, check 3).
3) Check the LED displays for trouble-
shooting on other remote controllers
whether an error occurs.
If an error is found,
-> If an error is found, check the check
code definition, and correct the error.
If no error is found,
-> Indoor unit board failure
1) Turn off the power source of LOSSNAY
for 5 or more minutes, and turn it on
again. If the error is accidental, it will run
normally.If not, check the cause 2).
2) Check the causes of (1) - (5). If the
cause is found, correct it. If no cause is
found, check 3).
3) Same cause as that for indoor unit de-
scribed in 3)