19
(For the separate indoor/outdoor unit power sup-
ply system)
1Power supply of 208/230V AC is not supplied to
indoor unit.
2The connectors of the optional replacement kit are
not used.
3Defective indoor controller board
4Defective indoor power board
10-3. 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.
1Power supply of rated voltage is not supplied to out-
door unit.
2Defective outdoor controller circuit board
3Power supply of 208/230V is not supplied to indoor
unit.
4Defective indoor power board
5Defective indoor controller board
1Check 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).
2Check 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).
3Check the voltage between indoor terminal
block S1 and S2.
• When AC 208/230V is not detected,
check indoor/outdoor unit connecting
wire for mis-wiring.
• When AC 208/230V is detected,
check 4(below).
4Check voltage output from CN2S on indoor
power board (DC13.1V). Refer to 10-6-1.
• When no voltage is output, check the
wiring connection.
• When output voltage is between
DC12.5V and DC13.7V, check 5
(below).
5Check 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.
1Check 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).
2Check 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
method of connecting the connectors,
check 3(below).
3Check 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).
4Check 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 con-
troller board is defective.
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