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9-3. TROUBLE-SHOOTING BY INFERIOR PHENOMENA
Phenomena
(1)LED2 on indoor control p.c.
board is off.
(2)LED2 on indoor control p.c.
board is blinking.
46
Factor
• When LED1 on indoor control p.c. board is also off.
1 Power supply of 220~240V is not supplied to outdoor
unit.
2 Defective outdoor control p.c. board
3 Power supply of 220~240V is not supplied to indoor
unit.
4 Defective indoor power board
5 Defective indoor control p.c. board
• When LED1 on indoor control p.c. board is lit.
1 Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant
address "0".)
• When LED1 on indoor control p.c. board is also
blinking.
Connection failure of indoor/outdoor unit connecting
wire
• When LED1 is lit.
Mis-wiring of remote controller wires
Under twin triple indoor unit system, 2 or more indoor
units are wired together.
1 Refrigerant address for outdoor unit is wrong or not
set.
Under grouping control system, there are some units
whose refrigerant address is 0.
2 Short-circuit of remote controller wires
3 Defective remote controller
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
1 Check the voltage of outdoor power sup-
ply terminal block (L, N)
• When AC 220~240V is not detected.
Check the power wiring to outdoor unit
and the breaker.
• When AC 220~240V is detected.
—Check 2 (below).
2 Check the voltage between outdoor ter-
minal block S1 and S2.
• When AC 220~240V is not detected.
Check the fuse on outdoor control p.c.
board (10A).
Check the wiring connection.
• When AC 220~240V is detected.
—Check 3 (below).
3 Check the voltage between indoor termi-
nal block S1 and S2.
• When AC 220~240V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.
• When AC 220~240V is detected.
—Check 4 (below).
4 Check voltage output from CN2S on
indoor power board (DC14V).
• When no voltage is output.
Check the fuse on power board.
Check the wiring connection.
• When output voltage is between 12.6V
and 16V.
—Check 5 (below).
5 Check the wiring connection between
indoor control p.c. board and power
board.
If no problems are found, indoor control
p.c. board is defective.
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 con-
nected, set one of the units to "0".)
Set refrigerant address using SW1 (3-6)
on outdoor control p.c. board.
Check indoor/outdoor unit connecting wire
for connection failure. Check the connection
of remote controller wires in case of twin
triple indoor unit system. When 2 or more
indoor units are wired in one refrigerant sys-
tem, connect remote controller wires to one
of those units.
1 Check the setting of refrigerant address
in case of grouping control system.
If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
control p.c. board.
23 Remove remote controller wires and
check LED2 on indoor control p.c.
board.
• When LED2 is blinking, check the
short-circuit of remote controller wires.
• When LED2 is lit, connect remote con-
troller wires again and:
if LED2 is blinking, remote controller is
defective; if LED2 is lit, connection fail-
ure of remote controller terminal block
etc. has returned to normal.
Countermeasure
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