Mitsubishi Electric PUHY-P168, Service Handbook

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[
IX
Troubleshooting ]
(3) System connected to the system controllers (MELANS)
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
M-NET re-
mote con-
troller
failure (RC) M-NET re-
mote con-
troller (RC)
System
controller
(SC) No ac-
knowl-
edgement
(ACK) at IC
transmis-
sion to RC Same as grouping of units in a sys-
tem with multiple outdoor units Same remedy as that for grouping of units in
a system with multiple outdoor units
system
controller
(SC) No ac-
knowl-
edgement
(ACK) at
MELANS
transmis-
sion to RC 1. Error occurrence on some IC
(1) Same cause as that for system
with one outdoor unit
Same remedy as that for system with one
outdoor unit
2. Error occurrence on all IC in the
system with one outdoor unit
(1) An error is found by the outdoor
unit.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connect-
ed units (7102)
Address setting error (7105)
(2) Disconnection or short circuit of
the transmission line for the out-
door unit on the terminal block
for centralized control line con-
nection (TB7)
(3) Turn off the power source of the
outdoor unit.
(4) Malfunction of electrical system
for the outdoor unit
1) Check the LED display for troubleshoot-
ing on the outdoor unit.
->If an error is found, check the check
code definition, and correct the error.
->If no error is found, check 2).
2) Check (2) - (4) on the left.
3. Error occurrence on all IC
(1) Same causes as (1) - (4) de-
scribed in 2.
(2) The male power supply connec-
tor on the outdoor unit is con-
nected to the female power
supply switch connector (CN40)
for the transmission line for cen-
tralized control.
(3) Disconnection or shutdown of
the power source of the power
supply unit for transmission line
(4) System controller (MELANS)
malfunction
Check (1) - (4) on the left.