Mitsubishi Electric CITY MULTI CMB-WP1016V-GA1, Service Handbook

Page: 141 / 294

[
VIII
Troubleshooting ]
- 132 -
HWE1410A GB
6607
1. Error Code
No ACK error
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
6607
Error
source
address
Error dis-
play
Detection
method
Cause Check method and remedy
Outdoor
unit (OC)
ME re-
mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
No ac-
knowl-
edgement
(ACK) at
IC trans-
mission to
OC
(1) Contact failure of transmission line of OC or IC 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).
(2) Decrease of transmission line voltage/signal by ex-
ceeding acceptable 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
2
[AWG16] or more
(4) Indoor unit control board failure
HBC
control-
ler (HB)
ME re-
mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
No ac-
knowl-
edgement
(ACK) at
IC trans-
mission to
HB
(1) When HBC controller address is changed or modi-
fied during operation.
Turn off the outdoor/in-
door 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) - (4).
(2) Faulty or disconnected transmission wiring of HBC
controller
(3) Disconnected connector of HBC controller (CN02)
(4) Faulty control board of HBC controller
Indoor
unit (IC)
ME re-
mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
No ac-
knowl-
edgement
(ACK) at
RC trans-
mission to
IC
(1) When IC unit address is changed or modified during
operation.
Turn off the outdoor/in-
door 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).
(2) Faulty or disconnected IC transmission wiring
(3) Disconnected IC connector
(CN2M)
(4) Indoor unit controller failure
(5) ME remote controller failure
LOSS-
NAY
(LC)
ME re-
mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
No ac-
knowl-
edgement
(ACK) at
IC trans-
mission to
LC
(1) The power source of LOSSNAY has been shut off. 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).
(2) When the address of LOSSNAY is changed in the
middle of the operation
(3) Faulty or disconnected transmission wiring of
LOSSNAY
(4) Disconnected connector (CN1) on LOSSNAY
(5) Controller failure of LOSSNAY
ME re-
mote
control-
ler (RC)
ME re-
mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
No ac-
knowl-
edgement
(ACK) at
IC trans-
mission to
RC
(1) Faulty transmission wiring at IC unit side. 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).
(2) Faulty wiring of the transmission line for ME remote
controller
(3) When the address of ME remote controller is
changed in the middle of the operation
(4) ME remote controller failure
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