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12
8-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
OPERATION INDICATO
R
lamp on the indoor unit is
flashing on and off.
Outdoor unit
operates in
only Test run
operation.
Outdoor unit
doesn't
operate
even in
Test run
operation.
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 8-6.
"Test point
diagram and
voltage".
Refer to 8-5. B
"Check of
remote controller
and receiver
P.C. board".
Left lamp
2-time flash
Cause:
Indoor unit
• Trouble of room
temperature/
indoor coil
thermistor
Left lamp
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Check room
temperature
thermistor and
indoor coil thermistor.
Refer to 8-6.
"Test point diagram
and voltage".
Refer to 8-5.
A
"Check of
indoor fan
motor".
1. Check indoor /
outdoor
connecting wire.
2. Refer to 8-5.
C
"Check of indoor
electronic control
P.C. board".
Check of
wiring
diagram
of outdoor
unit.
Left lamp
4-time flash
Cause:
Indoor unit
• Trouble of
indoor control
system
Replace the
indoor
electronic
control P.
C.
board.
As for outdoor unit,
refer to service
manual TBH016
Both lamps
(Left and right)
Flash on and off at
0.5
-
second intervals
Cause:
Indoor unit
• The horizontal vanes
are not installed
correctly.
Refer to 8-5. D
"Check of installation
of the horizontal vane".