28
(For the separate indoor/outdoor unit power sup-
ply system)
1
Power supply of 208/230V 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
10-4. 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 208/230V 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 (L1,L2).
• When AC 208/230V is not detected,
check the power wiring to outdoor unit
and the breaker.
• When AC 208/230V is detected,
check
2
(below).
2
Check the voltage between outdoor
terminal block S1 and S2.
• When AC 208/230V is not detected,
—check the fuse on outdoor controller
circuit board.
—check the wiring connection.
• When AC 208/230V is detected,
check
3
(below).
3
Check the voltage between indoor terminal
block S1 and S2.
• When AC 208/230V is not detected,
check indoor/outdoor unit connecting
wire for miswiring.
• When AC 208/230V is detected,
check
4
(below).
4
Check voltage output from CN2S on indoor
power board (DC13.1V). Refer to 10-7-1.
• When no voltage is output, check the
wiring connection.
• When output voltage is between
DC12.5V and DC13.7V, 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.
1
Check the voltage of indoor power supply
terminal block (L1,L2).
• When AC208/230V is not detected,
check the power supply wiring.
• When AC208/230V 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 instal-
lation manual of an optional kit.
• When there is no problem in the meth-
od of connecting the connectors, check
3
(below).
3
Check voltage output from CNDK on
indoor controller board.
• When AC208/230V 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 AC208/230V 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 DC12.5~13.7V is detected, check
the wiring connection between CN2S
on indoor power board and CN2D on
indoor power board.
If no problem are found, indoor control-
ler board is defective.