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[ IX Troubleshooting ]
- 270 -
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
(2) Grouping of units in a system with multiple heat source units
6607
Error
source
address
Error display
Detection
method
Cause Check method and remedy
Heat
source
unit
(OC)
ME remote
controller (RC)
MA remote
controller (MA)
No acknowl-
edgement
(ACK) at IC
transmission to
OC
Same cause as that for system
with one heat source unit
Same remedy as that for sys-
tem with one heat source unit
BC con-
troller
(BC)
ME remote
controller
(RC)
MA remote
controller
(MA)
No acknowl-
edgement
(ACK) at IC
transmission to
BC
Same cause as that for system
with one heat source unit
Same remedy as that for sys-
tem with one heat source unit
Indoor
unit
(IC)
ME remote
controller (RC)
MA remote
controller (MA)
No acknowl-
edgement
(ACK) at RC
transmission to
IC
(1) Same causes as (1) - (5) for sys-
tem with one heat source unit
1) Turn off the power sources of
the heat source and indoor
units for 5 or more minutes,
and turn them on again. If the
error is accidental, the will run
normally.If not, check the
cause 2).
(2) Disconnection or short circuit of
the transmission line for the heat
source unit on the terminal block
for centralized control line con-
nection (TB7)
2) Check the causes of (1) - (5). If
the cause is found, correct it. If
no cause is found, check 3).
(3) When multiple heat source units
are connected and the power
source of one of the heat source
units has been shut off.
3) Check the LED displays for
troubleshooting on other re-
mote controllers whether an
error occurs.
(4) The male power supply connector
of the heat source unit is not con-
nected to the female power supply
switch connector (CN40).
If an error is found,
-> If an error is found, check
the check code definition, and
correct the error.
If no error is found,
-> Indoor unit board failure
(5) The male power supply connec-
tors on 2 or more heat source
units are connected to the female
power supply switch connector
(CN40) for centralized control.
If an error occurs, after the unit
runs normally once, the following
causes may be considered.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of con-
nected units (7102)
Address setting error (7105)