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10-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks.
OPERATION INDICATOR
No. Abnormal
Operation indicator lamp
point
Left lamp blinks.
0.5-second ON
Miswiring
1
or serial
signal
0.5-second OFF
Left lamp blinks.
Indoor coil
2-time blink
thermistor
2
Room
2.5-second OFF
temperature
thermistor
Left lamp blinks.
3-time blink
3 Indoor fan
motor
2.5-second OFF
Left lamp blinks.
4-time blink
Indoor
4
control
system
Left lamp blinks.
5-time blink
Outdoor
5
power
system
Left lamp blinks.
6-time blink
6 Outdoor
thermistors
Left lamp blinks.
7-time blink
Outdoor
7
control
system
Left lamp blinks.
14-time blink or more
2.5-second OFF
Other
8
abnormality
*2 on 10-3
Upper lamp lights up.
Outdoor
9
control
system
NOTE:
The indoor unit may have been connected to a non-low-standby-power model outdoor unit. To use a low-standby-power-
model, clear the error history by referring to "Deleting the memorized abnormal condition" described in 10-2.1. When the
error history is being cleared, the connection information also will be initialized. The indoor unit will be compatible with a
low-standby-power model after initialization. If the operation indicator lamp continues to blink as shown in No.1 after the pro-
"How to check miswiring and serial error".
cedure, refer to 10-6.
OBH849G
Lit
Blinking
Not lit
2.5-second OFF
2.5-second OFF
2.5-second OFF
2.5-second OFF
Symptom
Condition
The serial signal from the outdoor
unit is not received for 6 minutes.
The indoor unit is connected to
a low-standby-power model after
once connected to a non-low-
standby-power model.
The indoor coil or the room tem-
perature thermistor is short or
open circuit.
The rotational frequency feedback
signal is not emitted during the
indoor fan operation.
It cannot properly read data in the
nonvolatile memory of the indoor
electronic control P.C. board.
It consecutively occurs 3 times
that the compressor stops for
Indoor unit and
overcurrent protection or start-up
outdoor unit do
failure protection within 1 minute
not operate.
after start-up.
The outdoor thermistors short or
open circuit during the compressor
operation.
It cannot properly read data in the
nonvolatile memory of the inverter
P.C. board or the outdoor elec-
tronic control P.C. board.
An abnormality other than above
mentioned is detected.
An abnormality of the indoor
thermistors, the defrost thermistor
or ambient temperature thermistor
is detected.
It cannot properly read data in the
Outdoor unit
nonvolatile memory of the inverter
does not oper-
ate
P.C. board.
27
Remedy
"How to
• Refer to 10-6.
check miswiring and serial
signal error".
• Refer to NOTE.
• Refer to the characteristics
of indoor coil thermistor, and
the room temperature therm-
istor (10-7.).
"Check of
• Refer to 10-6.
indoor fan motor".
• Replace the indoor electronic
control P.C. board.
• Refer to "How to check of
inverter/compressor".
Refer to outdoor unit service
manual
• Check the stop valve.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
• Replace the inverter P.C.
board or the outdoor elec-
tronic control P.C. board.
Refer to outdoor unit service
manual.
• Check the stop valve.
• Check the 4-way valve.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor
unit.
• Refer to TEST POINT DIA-
GRAM AND VOLTAGE" on
the service manual of indoor
and outdoor unit for the char-
acteristics of the thermistors.
(Do not start the operation
again without repair to pre-
vent hazards.)
• Check the blinking pattern of
the LED on the inverter P.C.
board.
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