21
(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
4
Defective indoor power board
9-3. TROUBLESHOOTING BY INFERIOR PHENOMENA
Note: Refer to the manual of outdoor unit 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 220–240 V is not supplied to indoor
unit
4
Defective indoor power board
5
Defective indoor controller board
1
Check the voltage of outdoor power
supply terminal block (L, N) or (L3, 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 cir-
cuit 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 mis-wiring.
• When 220–240 V AC is detected.
—Check
4
(below).
4
Check voltage output from CN2S on indoor
power board (13.1 V DC). Refer to "9-6-1.
Power board".
• When no voltage is output.
Check the wiring connection.
• When output voltage is between 12.5 V DC
and 13.7 V DC.
—Check
5
(below).
5
Check the wiring connection between indoor
controller board and indoor power board.
Check the fuse on indoor controller board.
If no problems are 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
Reconfirm 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.
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 meth-
od 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 voltage output from CNDK on indoor
controller board.
• When 220–240 V AC is not detected.
Check the fuse on indoor controller board.
Check the wiring connection between
indoor power supply terminal block and
CND on indoor controller board.
• When 220–240 V AC is detected.
-Check
4
(below).
4
Check voltage output from CN2S on indoor
power board.
• When no voltage output.
Check the wiring connection between
CNDK on indoor controller board and
CNSK on indoor power board.
If no problem are found, indoor power
board is defective.
• When 12.5–13.7 V DC is detected.
Check the wiring connection between
CN2S on indoor power board and
CN2D on indoor power board.
If no problem is found, indoor controller
board is defective.
OCH492A
