Mitsubishi Electric PUHY-P168, Service Handbook

Page: 268 / 404

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[
IX
Troubleshooting ]
-
(2) Grouping of units in a system with multiple outdoor units
Error Code Error definition and error detection method
6607
(Contin-
ued)
No ACK abnormality 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).
Error
source ad-
dress
Error dis-
play
Detection
method
Cause Check method and remedy
Outdoor
unit
(OC) M-NET re-
mote control-
ler (RC)
MA remote
controller
(MA) No ac-
knowledge-
ment (ACK)
at IC trans-
mission to
OC Same cause as that for system with
one outdoor unit Same remedy as that for system with one
outdoor unit
Indoor
unit
(IC) M-NET re-
mote con-
troller (RC)
MA remote
controller
(MA) No ac-
knowl-
edgement
(ACK) at
RC trans-
mission to
IC
(1) Same causes as (1) - (5) for system
with one outdoor unit
(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 normal-
ly once, the following causes may be consid-
ered.
ΠTotal capacity error (7100)
ΠCapacity code error (7101)
Œ
Error in the number of connected
units (7102)
ΠAddress setting error (7105)
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
LOSSNAY
(LC) M-NET re-
mote con-
troller (RC)
MA remote
controller
(MA) No ac-
knowl-
edgement
(ACK) at IC
transmis-
sion to LC
(1) Same causes as (1) - (5) for system
with one outdoor unit
(Interlocked operation between LOSS-
NAY and the indoor units in the system
in which the indoor units connected to
different outdoor units are grouped)
(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.
ΠTotal capacity error (7100)
Œ
Capacity code error (7101)
ΠError in the number of connected
units (7102)
ΠAddress setting error (7105)
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)