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
Outdoor
unit
(OC) M-NET re-
mote control-
ler (RC)
System con-
troller (SC)
MA remote
controller
(MA) No ac-
knowl-
edgement
(ACK) at
BC trans-
mission to
OC Same cause as that for system with
one outdoor unit Same remedy as that for system with one
outdoor unit
BC control-
ler (BC)
M-NET re-
mote control-
ler (RC)
system con-
troller (SC)
MA remote
controller
(MA)
No ac-
knowl-
edgement
(ACK) at IC
transmis-
sion to BC 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) No acknowl-
edgement
(ACK) at RC
transmission
to IC 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
SC trans-
mission to
IC 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) Total capacity error (7100)
(2) Capacity code error (7101)
(3) Error in the number of connected units
(7102)
(4) Address setting error (7105)
(5) Disconnection or short circuit of the
transmission line for the outdoor unit
on the terminal block for centralized
control line connection (TB7)
(6) Turn off the power source of the out-
door unit
(7) 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 (5) - (7) on the left.
3. Error occurrence on all IC
(1) Same causes as (1) - (7) described in
2.
(2) The male power supply connectors on
2 or more outdoor units are connected
to the female power supply switch con-
nector (CN40) for the transmission line
for centralized control.
(3) Disconnection or shutdown of the pow-
er source of the power supply unit for
transmission line
(4) System controller (MELANS) malfunc-
tion
Check voltage of the transmission line for
centralized control.
20V or more : Check (1) and (2) on the
left.
Less than 20V : Check (3) on the left.