Service manual

36
11-2-1. Troubleshooting check table
❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
NO.
1
Abnormal
point
Indoor coil
thermistor
Room
tempera-
ture ther-
mistor
Indication
2-time flash
2.5-second OFF
Symptom
Outdoor unit
does not run.
Detect method
Detect Indoor coil/room tem-
perature thermistor short or
open circuit.
Check point
● Check resistance of thermistor.
● Reconnect connector
● Check indoor electronic control P.C.
board
11-2. Instruction of troubleshooting
Operation indicator
lamp
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
Operation indicator
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 "Test point
diagram and
voltage" on page 40.
Refer to D
"Check of
outdoor unit"
on page 39.
Refer to B
"Check of
remote controller
and receiver
P.C. board"
on page 38.

Refer to C
"Check of indoor
electronic control
P.C. board"
on page 39.
2-time flash
Cause: Indoor unit
• Trouble of room
temperature/ indoor
coil thermistor
Check room tempre-
ture thermistor and
indoor coil thermistor
Refer to "Test point
diagram and voltage"
on page 40.
When the remote
controller is
pressed
or when the
EMERGENCY
OPERATION
switch is
pressed,
the fan doesn't
rotate, with
Power monitor
lamp on.
Refer to A
"Check of
indoor fan
motor" on
page 38.
OB270--2.qxp 4/13/01 3:03 PM Page 36