Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 267

[ IX Troubleshooting ]
(1) System with one outdoor unit
Error Code
6607 No ACK abnormality
Error
Error dis-
source ad-
play
dress
Outdoor M-NET re-
unit (OC) mote con-
troller (RC)
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)
M-NET re- M-NET re-
mote con- mote con-
troller(RC) 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- (1) Contact failure of transmission
knowl- line of OC or IC
edgement (2) Decrease of transmission line
(ACK) at voltage/signal by exceeding ac-
IC trans- ceptable range of transmission
mission to wiring .
OC Farthest:
200 m [656ft] or less
Remote controller wiring:
10m [656ft] or less
(3) Erroneous sizing of transmission
line (Not within the range below).
Wire diameter:
2
1.25mm [AWG16] or more
(4) Indoor unit main board failure
(1) When IC unit address is
No ac-
knowl- changed or modified during op-
edgement eration.
(ACK) at (2) Faulty or disconnected IC trans-
RC trans- mission wiring
mission to (3) Disconnected IC connector
IC (CN2M)
(4) Indoor unit board failure
(5) M-NET remote controller failure
No ac- (1) The power source of LOSSNAY
knowl- has been shut off.
edgement (2) When the address of LOSSNAY
(ACK) at IC is changed in the middle of the
transmis- operation
sion to LC (3) Faulty or disconnected transmis-
sion wiring of LOSSNAY
(4) Disconnected connector (CN1)
on LOSSNAY
(5) Controller failure of LOSSNAY
No ac- (1) Faulty transmission wiring at IC
knowl- unit side.
edgement (2) Faulty wiring of the transmission
(ACK) at IC line for M-NET remote controller
transmis- (3) When the address of M-NET re-
sion to RC mote controller is changed in the
middle of the operation
(4) M-NET remote controller failure
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Check method and remedy
Turn off the power source of the outdoor
unit, and turn it on again.
If the error is accidental, it will run normally.
If not, check the causes (1) - (4).
Turn off the outdoor/indoor units for 5 or
more minutes, and turn them on again.
If the error is accidental, they will run nor-
mally.
If not, check the causes (1) - (5).
Turn off the power source of LOSSNAY and
turn it on again.
If the error is accidental, it will run normally.
If not, check the causes (1) - (5).
Turn off the power source of the outdoor
unit for 5 minutes or more, and turn it on
again.
If the error is accidental, it will run normally.
If not, check the causes (1) - (4).