Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 271

[ IX Troubleshooting ]
Error Code
6607 No ACK abnormality
(Contin-
ued)
Error
Error dis-
source ad-
play
dress
M-NET re- M-NET re-
mote con- mote con-
troller (RC) troller (RC)
System
controller
(SC)
MA remote
controller
(MA)
system
controller
(SC)
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 as grouping of units in a sys-
knowl- tem with multiple outdoor units
edgement
(ACK) at IC
transmis-
sion to RC
No ac- 1. Error occurrence on some IC
knowl- (1) Same cause as that for system
edgement with one outdoor unit
(ACK) at
2. Error occurrence on all IC in the
MELANS
system with one outdoor unit
transmis-
(1) An error is found by the outdoor
sion to RC
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
3. Error occurrence on all IC
(1) Same causes as (1) - (4) de-
scribed in 2.
(2) When the power supply unit for
transmission lines is used and
the male power supply connec-
tor is connected to the female
power supply switch connector
(CN40) for the transmission line
for centralized control
(3) Disconnection or shutdown of
the power source of the power
supply unit for transmission line
(4) System controller (MELANS)
malfunction
- 262 -
Check method and remedy
Same remedy as that for grouping of units
in a system with multiple outdoor units
Same remedy as that for system with
one 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 the cause
2).
2) Check (2) - (4) on the left.
Check (1) - (4) on the left.