27
NOTE:
When the indoor unit has started operation and the above failures are detected (the first detection after the power ON),
the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp blinking.
Left lamp blinks.
7-time blink
2.5-second OFF
Left lamp blinks.
14-time blink or more
2.5-second OFF
No.
1
3
6
7
Symptom
Operation indicator lamp
Condition
Remedy
Left lamp blinks.
0.5-second ON
0.5-second OFF
Miswiring
or serial
signal
Outdoor
power
system
Outdoor
thermistors
Outdoor
control
system
Indoor coil
thermistor
When the serial signal from the outdoor unit is
not received for a maximum of 6 minutes.
The compressor stops 3 times consecutively
for over current protection or start-up failure
protection within 1 minute after start-up.
When the outdoor thermistors short or open
circuit during the compressor operation.
When it cannot properly read data in the
nonvolatile memory of the inverter P.C. board
or the outdoor electronic control P.C. board.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
• Refer to "Check of inverter/
compressor".
• Check the stop valve.
Refer to outdoor unit service
manual.
• Replace the inverter P.C.
board or the outdoor electronic
control P.C. board.
Refer to outdoor unit service
manual.
• Refer to 9-6. "How to check
miswiring and serial signal
error".
4
Indoor fan
motor
8
Abnormal
point
Room
temperature
thermistor
Left lamp blinks.
2-time blink
2.5-second OFF
When the indoor coil or the room temperature
thermistor is shorts or opens circuit.
• Refer to the characteristics of
indoor coil thermistor, and the
room temperature thermistor
on 9-7.
Left lamp blinks.
3-time blink
2.5-second OFF
When the rotational frequency feedback
signal is not emitted during the indoor fan
operation.
• Refer to 9-6. "Check of
indoor fan motor".
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Left lamp blinks.
5-time blink
2.5-second OFF
Left lamp blinks.
6-time blink
2.5-second OFF
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Other
abnormality
An abnormality other than above mentioned is
detected.
• Check the abnormality in
detail using the failure mode
recall function.
Refer to outdoor unit service
manual.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
9
5
Left lamp blinks.
4-time blink
2.5-second OFF
Indoor
control
system
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
Indoor unit
and outdoor
unit do not
operate.
• Replace the indoor electronic
control P.C. board.
2
• Float sensor is open.
• Float sensor detects abnormal water level.
• Check the float sensor
characteristics.
• Check the drain pump.
• Check the drain pipe.
• Check the connectors of float
sensor and the drain pump.
• Refer to 9-6. "Check of float
sensor".
Indoor unit
and outdoor
unit do not
operate.
Left lamp blinks.
9-time blink
2.5-second OFF
Drain
pump
9-4. TROUBLESHOOTING CHECK TABLE
NOTE:
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
OPERATION INDICATOR
Not lit
Blinking
Lit
· Blinking of OPERATION INDICATOR lamp (left-hand side lamp) indicates
abnormalities.
Self check table
OBH802B
