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–122–
Checking
code
6607
(continued)
Meaning, detecting method
System
compo-
sition
Generating
unit address
Display of
trouble
Detecting
method
Cause Checking method & countermeasure
No ACK error When no ACK signal is detected in 6 continuous times with 30 second
interval by transmission side controller, the transmission side detects error.
Note: The address/attribute shown on remote controller indicates the
controller not providing the answer (ACK).
1 Outdoor
unit (OC)
2 BC
controller
<master>
(BC)
3 BC
controller
<slave>
(BS)
4 Indoor
unit (IC)
5 Remote
controller
(RC)
Remote
control-
ler (RC)
Remote
control-
ler (RC)
Remote
control-
ler (RC)
Remote
control-
ler (RC)
Remote
control-
ler (RC)
No reply
(ACK) at
OC
transmis-
sion to BC
No replay
(ACK) at
BC <master>
transmis-
sion to IC
No reply
(ACK) at
BC <slave>
transmis-
sion to BC
<master>
No reply
(ACK) at IC
transmis-
sion to RC
No reply
(ACK) at
RC
transmis-
sion to IC
As same that for single refrigerant system.
As same that for single refrigerant system.
As same that for single refrigerant system.
1) Cause of 1) ~ 5) of “Cause for single refriger-
ant system”.
2) Disconnection or short circuit of transmission
line of OC terminal block for centralized con-
trol (TB7).
3) Shut down of OC unit power source of one
re-frigerant system.
4) Neglecting insertion of OC unit power supply
connector (CN40).
5) Inserting more than 2 sets of power supply
connector (CN40) for centralized control use.
For generation after normal operation conduct-
ed once, the following causes can be consider-
ed.
• Total capacity error (7100)
• Capacity code setting error (7101)
• Connecting set number error (7102)
• Address setting error (7105)
1) Cause of 1) ~ 3) of “Cause for single refri-
gerant system”.
2) Disconnection or short circuit of transmission
line of OC terminal block for centralized con-
trol (TB7).
3) Shut down of OC unit power source of one
Same as measure for single refrigerant
system.
Same as measure for single refrigerant
system.
Same as measure for single refrigerant
system.
a) Shut down the power source of both
IC and OC for over 5 minutes simul-
taneously, and make them again.
Normal state will be returned incase
of accidental trouble.
b) Check for 1) ~ 5) of causes. If cause
is found, remedy it.
c) Check other remote controller or OC
unit LED for troubleshooting for
trouble.
Trouble →
Modify the trouble ac-
cording to the content
of check code.
No trouble → Faulty indoor con-
troller
a) Shut down the power source of OC
for over 5 minute, and make it again.
Normal state will be returned in case
of accidental trouble.
b) Check for 1) ~ 5) of causes. If cause
is found, remedy it.
When normal state can not be ob-
tained, check 1) ~ 5) of causes.
(2) Group operation system using plural refrigerants