12
No.
1
2
3
4
5
Symptom
Operation indicator lamp
Detection method
Check point
Mis-Wiring
or Serial
signal
Outdoor
power
system
Outdoor
thermistor
Outdoor
control
system
Indoor coil
thermistor
When it consecutively occurs 3 times that
compressor stops for overcurrent protection
within 1 minute after start-up.
<Thermistor short>
Thermistors are abnormal when they short
after compressor start-up.
<Thermistor open>
Thermistors are abnormal when they open
after compressor start-up.
However, discharge temperature thermistor is
abnormal when open circuit is detected more
than 10 minutes after compressor start-up.
When it cannot properly read data in the
nonvolatile memory of inverter P.C. board or
outdoor electronic control P.C. board.
• Shortage of refrigerant.
Refer to "Check of outdoor
thermistor".
Refer to service manual
OB328 REVISED EDITION-A
or OB346 REVISED EDITION-A.
• Refer to "Check of inverter/
compressor".
Refer to service manual
OB328 REVISED EDITION-A
or OB346 REVISED EDITION-A.
• Check the inverter P.C.
board or outdoor electronic
control P.C. board.
Refer to service manual
OB328 REVISED EDITION-A
or OB346 REVISED EDITION-A.
• Refer to
D
"How to check
mis-wiring and serial signal
error." on page 15 or 16.
6
Abnormal
point
Outdoor unit
does not
operate.
Room
tempera-
ture
thermistor
2-time flash
2.5-second OFF
Detect Indoor coil/room temperature
thermistor short or open circuit every 8
seconds during operation.
• Refer to the characteristics of
indoor coil thermistor, and
room temperature thermistor
on page 17 or 18.
4-time flash
2.5-second OFF
Indoor
control
system
When it cannot properly read data in the
nonvolatile memory of indoor electronic
control P.C. board.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
• Replace the indoor electronic
control P.C. board.
5-time flash
2.5-second OFF
6-time flash
2.5-second OFF
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
3 minutes after power supply turns ON, when
serial signal is not received.
0.5-second ON
0.5-second OFF
7-time flash
2.5-second OFF
1. Troubleshooting check table
NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
Self check table
Operation Indicator
· Flashing of the OPERATION INDICATOR lamp (left-hand side lamp)
indicates possible abnormalities.
· The OPERATION INDICATOR lamp (left-hand side lamp) is
lighting during normal operation.
• The following indication applies regardless of shape of the indicator.
Lighted
Not lighted
OB344A--1.qxp 04.6.14 1:04 PM Page 12
