25
Start
Indoor unit
operates.
Outdoor unit
does not
operate.
Indoor unit
does not receive
the signal from
remote controller.
OPERATION INDICATOR
lamp on the indoor unit is
blinking on and off.
Outdoor unit
operates only
in Test Run
operation.
1
Outdoor unit
does not
operate
even in
Test Run
operation.
1
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 9-7.
"TEST POINT
DIAGRAM AND
VOLTAGE".
Refer to
"How to check
inverter/
compressor".
1. Check indoor/outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)
2. Refer to 9-6.
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
Unit does not
operate
normal
operation in
COOL or
HEAT mode.
Refer to
"Check of
R.V. coil".
Left lamp
Blink on and off
at 0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Mis-wiring
or trouble
of serial signal
Left lamp
2-time blink
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
Left lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Left lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Left lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Left lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer to 9-6.
"How to
check
miswiring
and serial
signal error
(when
outdoor unit
does not work)".
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to 9-7.
"Test point
diagram and
voltage".
Refer to 9-6.
"Check of
indoor fan
motor".
Refer to
"How to check
the inverter/
compressor".
Refer to
"Check of
outdoor
thermistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Left lamp
9-time blink
Cause:
Indoor unit
• Trouble of
float sensor
or drain
pump
Refer to 9-6.
"Check of
float sensor".
Check the
drain pump.
Left lamp
14-time blink
or more
Cause:
Outdoor unit
• Other
abnormality
• Check the
stop valve.
Check
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."
Left lamp
4-time blink
Cause:
Indoor unit
• Trouble of
indoor unit
control
system
Replace the
indoor
electronic
control
P.C. board.
Refer to outdoor unit service manual.
Indoor unit operates.
Outdoor unit does not
operate normally.
If blinking of OPERATION
INDICATOR lamp cannot be
checked, it can be checked with
failure mode recall function.
1
"Test Run operation" means the
operation within 30 minutes after
EMERGENCY OPERATION switch
is pressed.
Refer to 9-6.
"Check of
remote controller,
receiver P.C.
board and
indoor electronic
control P.C.
board".
9-3. INSTRUCTION OF TROUBLESHOOTING
OBHT802
