24
10-3. INSTRUCTION OF TROUBLESHOOTING
Indoor unit oper-
ates.
Outdoor unit
does not operate.
Indoor unit does
not receive the
signal from re-
mote controller.
OPERATION INDICATOR
lamp on the indoor unit is
f ashing ON and OFF.
Outdoor unit
operates only
in Test Run
operation.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 10-7.
"Test point
diagram and
voltage".
Refer to 10-6.
"Check of remote
controller and
indoor electronic
control P.C. board".
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Check the outdoor fuse (F).
3. Refer to 10-6. "Check
of indoor P.C. board
and indoor fan motor".
Upper lamp
2-time f ash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Upper lamp
3-time f ash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Upper lamp
4-time f ash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Start
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer to
10-7. "Test
point diagram
and voltage".
Refer to
10-6.
"Check of
indoor fan
motor".
Replace the
indoor elec-
tronic control
P.C. board.
Outdoor unit
does not
operate even
in "Test run
operation".
1. Check
the wiring
diagram of
the outdoor
unit.
2. Check the
outdoor
fuse.
Check the
indoor fuse
(F11), outdoor
fuse (F) and
the compres-
sor contactor
(52C).
Indoor and
outdoor unit
do not operate.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Upper lamp
14-time f ash
Cause:
Outdoor unit
• Troubles
regarding
refrigerant
circuit
Refer to 10-4
No. 4 "Rem-
edy".
"Test Run operation" means the
operation within 30 minutes af-
ter EMERGENCY OPERATION
switch is pressed.
Refer to outdoor unit service manual.
OBH621A
