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[ IX Troubleshooting ]
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HWE09080 GB
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 heat source unit
6607
Error
source
address
Error dis-
play
Detection
method
Cause Check method and remedy
Heat
source
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 heat
source 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) Heat source unit control board failure
BC con-
troller
(BC)
ME re-
mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
No ac-
knowl-
edgement
(ACK) at
IC trans-
mission to
BC
(1) When BC controller address is changed or modified
during operation.
Turn off the heat source-
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) - (4).
(2) Faulty or disconnected transmission wiring of BC
controller
(3) Disconnected connector of BC controller (CN02)
(4) Faulty control board of BC 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 heat source-
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).
(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 heat
source 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