25
9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA
Note: Refer to the outdoor unit's service manual for the detail of remote controller.
Phenomena
Cause
Countermeasure
(1) LED2 on indoor controller board
is off.
• When LED1 on indoor controller board is also off.
1
Power supply of rated voltage is not supplied to out-
door unit.
2
Defective outdoor controller circuit board
3
Power supply of 220–240V is not supplied to indoor
unit.
4
Defective indoor controller board
(For the separate indoor/outdoor unit power sup-
ply system)
1
Power supply of 220–240 V AC is not supplied to
indoor unit.
2
The connectors of the optional replacement kit are
not used.
3
Defective indoor controller board
1
Check the voltage of outdoor power
supply terminal block (L, N) or (L
3
, N).
• When 220–240 V AC is not detected,
check the power wiring to outdoor unit
and the breaker.
• When 220–240 V AC is detected, check
2
(below).
2
Check the voltage between outdoor
terminal block S1 and S2.
• When 220–240 V AC is not detected,
— check the fuse on outdoor controller
circuit board.
— check the wiring connection.
• When 220–240 V AC is detected, check
3
(below).
3
Check the voltage between indoor
terminal block S1 and S2.
• When 220–240 V AC is not detected,
check indoor/outdoor unit connecting
wire for miswiring.
• When 220–240 V AC is detected, check
4
(below).
4
Check the fuse on indoor controller
board.
Check the wiring connection.
If no problem is found, indoor controller
board is defective.
1
Check the voltage of indoor power supply
terminal block (L, N).
• When 220–240 V AC is not detected,
check the power supply wiring.
• When 220–240 V AC is detected, check
2
(below).
2
Check that there is no problem in the
method of connecting the connectors.
• When there are problems in the method
of connecting the connectors, connect
the connector correctly referring to
installation manual of an optional kit.
• When there is no problem in the method
of connecting the connectors, check
3
(below).
3
Check the fuse on indoor controller
board.
Check the wiring connection.
If no problem is found, indoor controller
board is defective.
• When LED1 on indoor controller board is lit.
1
Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant address
“0”.)
1
Check again the setting of refrigerant
address for outdoor unit.
Set the refrigerant address to “0”.
(For grouping control system under which
2 or more outdoor units are connected,
set one of the units to “0”.)
Set refrigerant address using SW1 (3-6)
on outdoor controller circuit board.
OCH661
