Mitsubishi Electric PUHY-(E)P200 Service Handbook page 196

[ IX Troubleshooting ]
1. Error Code
6607
No ACK abnormality
2. 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 trans-
mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(1) System with one outdoor unit
Error
source ad- Error display
dress
Outdoor M-NET re-
unit (OC) mote controller
(RC)
MA remote
controller (MA)
Indoor unit M-NET re-
(IC) mote controller
(RC)
MA remote
controller (MA)
LOSSNAY M-NET re-
(LC) mote controller
(RC)
MA remote
controller (MA)
M-NET re- M-NET re-
mote con- mote controller
troller (RC) (RC)
MA remote
controller (MA)
HWE07010
Detection
method
No acknowl- (1) Contact failure of transmission
edgement line of OC or IC
(ACK) at IC
(2) Decrease of transmission line
transmis-
voltage/signal by exceeding ac-
sion to OC
ceptable range of transmission
wiring.
Farthest:200 m [656ft] or less
Remote controller wiring:
10m [32ft] or less
(3) Erroneous sizing of transmission
line (Not within the range below).
Wire diameter:
1.25mm
(4) Indoor unit control board failure
No acknowl- (1) When IC unit address is changed
edgement or modified during operation.
(ACK) at RC
(2) Faulty or disconnected IC trans-
transmis-
mission wiring
sion to IC
(3) Disconnected IC connector
(CN2M)
(4) Indoor unit controller failure
(5) M-NET remote controller failure
No acknowl- (1) The power source of LOSSNAY
edgement has been shut off.
(ACK) at IC
(2) When the address of LOSSNAY
transmis-
is changed in the middle of the
sion to LC
operation
(3) Faulty or disconnected transmis-
sion wiring of LOSSNAY
(4) Disconnected connector (CN1)
on LOSSNAY
(5) Controller failure of LOSSNAY
No acknowl- (1) Faulty transmission wiring at IC
edgement unit side.
(ACK) at IC
(2) Faulty wiring of the transmission
transmis-
line for M-NET remote controller
sion to RC
(3) When the address of M-NET re-
mote controller is changed in the
middle of the operation
(4) M-NET remote controller failure
- 187 -
Cause
2
[AWG16] or more
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 normally.
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).
GB