B-105
TROUBLESHOOTING
OUTDOOR UNIT
S series
OUTDOOR UNIT
Lighting
5 times
6 times
Once
Twice
3 times
4 times
9 times
5 times
6 times
7 times
Goes out
Goes out
Discharge temperature
thermistor
Defrost thermistor
Ambient temperature
thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
EEPROM
Communication error
between P.C. boards
Communication between P.C.
boards protection
Current sensor
Current sensor protection
Zero cross detecting circuit
Zero cross detecting circuit
protection
Converter protection
Bus-bar voltage protection (1)
Bus-bar voltage protection (2)
+
Even if this protection stop is
performed continuously 3
times, it does not mean the
abnormality in outdoor power
system.
Outdoor thermistors
Outdoor control system
Converter control
system
Outdoor LED indication
LED1 LED2
Abnormal point
(Failure mode)
Details of abnormal
Detecting method
Check point
When a short circuit is detected in the
thermistor during operation, or when an
open circuit is detected in the thermistor
after 10 minutes of compressor start-up.
When a short circuit is detected in the
thermistor during operation, or when an
open circuit is detected in the thermistor
after 5 minutes of compressor start-up.
When a short or open circuit is
detected in the thermistor during
operation.
When a short circuit is detected in the
thermistor during operation, or when an
open circuit is detected in the thermistor
after 5 minutes (in cooling) and 10 minutes
(in heating) of compressor start-up.
When nonvolatile memory data cannot
be read properly, unit stops.
When the communication between boards
protection stop is continuously
performed twice.
Communication error occurs between the
electronic control P.C.board and power
board for more than 10 seconds.
Current sensor protection stop is
continuously performed twice.
When a short or open circuit is
detected in the current sensor during
compressor operating.
The protection stop of the zero cross
detecting circuit is continuously performed
10 times.
When zero cross signal cannot be
detected while the compressor is
operating.
When a failure is detected in the
operation of the converter during
operation.
When the bus-bar voltage exceeds 400V
or falls to 200V or below during
compressor operating.
When the bus-bar voltage exceeds
400V or falls to 50V or below during
compressor operating.
• Check the outdoor thermistors.
• Replace the outdoor electronic
control P.C. board.
• Check the outdoor thermistors.
• Replace the outdoor electronic
control P.C. board.
• Check the connecting wire between
outdoor electronic control P.C. board and
power board.
• Replace the power board.
• Check the connecting wire among
electronic control P.C. board, noise
filter P.C. board and power board.
• Replace the power board.
Outdoor electronic control P.C. board(Parts side)
Lighting
LED2 LED1
SUZ-KA60VA SUZ-KA71VA
NOTE 1. The location of LED is illustrated at the right figure.
2. LED is lighted during normal operation.