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Checking
code
Meaning, detecting method
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).
Generating
unit address
Display of
trouble
Detecting
method
No reply
(ACK) at IC
transmission
to OC
No reply
(ACK) at
transmission
of SC to IC
No reply
(ACK) at
transmission
of IC to RC
No reply
(ACK) at
transmission
of MELANS
to RC
Remote
controller
(RC)
Remote
controller
(RC)
Remote
controller
(RC)
System
compo-
sition
1Outdoor
unit (OC)
2Indoor
unit
(IC)
3Remote
controller
(RC)
6607
(continued)
As same that for single refrigerant system
Trouble of partial IC units:
1) Same cause as that for single refrigerant
system
Trouble of all ICs in one refrigerant system:
1) Cause of total capacity error (7100)
2) Cause of capacity code setting error(7101)
3) Cause of connecting number error (7102)
4) Cause of address setting error (7105)
5) Slipping off or short circuit of transmission
line of OC unit terminal block for central
control (TB7)
6) Power source shut down of OC unit
7) Trouble of OC unit electrical system
Trouble of all ICs:
1) Cause of 1) ~ 7) of (b)
2) Insertion of power supply connector (CN40)
into OC unit transmission line for central-
ized control
3) Slipping off or power source shut down of
power supply unit for transmission line
4) Faulty system controller (MELANS)
Same cause as that for plural refrigerant system
Trouble of partial IC units:
1) Same cause of that for single refrigerant
system
Trouble of all ICs in one refrigerant system:
1) Error detected by OC unit
Total capacity error (7100)
Capacity code setting error (7101)
Connecting number error (7102)
Address setting error (7105)
2) Slipping off or short circuit of transmission
line of OC unit terminal block for central
control (TB7)
3) Power source shut down of OC unit
4) Trouble of OC unit electrical system
Trouble of all ICs:
1) Cause of 1) ~ 7) of (b)
2) Insertion of power supply connector (CN40)
into OC unit transmission line for central-
ized control
3) Slipping off or power shutdown of power
supply unit for transmission line
4) Faulty MELANS
Same countermeasure as that for
single refrigerant system
→ Same countermeasure as that for
single refrigerant system
Confirm OC trouble diagnosis LED
→At trouble generation, check for
the content according to check
code.
→At no trouble, follow b).
Check the content of 5)~7) shown
left.
Confirm voltage of transmission line
for centralized control
•More than 20V →Confirm
1) 2)
left.
•Less than 20V →Confirm
3)
left.
Same countermeasure as that for plur-
al refrigerant system
→ Same countermeasure as that for
single refrigerant system
Confirm OC trouble diagnosis LED
→ At trouble generation, check for
the content according to check
code.
→ At no trouble, follow (b).
Check the content of 2)~4) shown left.
Check the causes of 1) ~ 4) left.
(3) Connecting system with system controller (MELANS)
Cause Checking method & countermeasure
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