Service manual

26
Lighting
Goes out
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 LED indication
LED1 LED2
Abnormal point
(Failure mode)
Details of abnormal Detecting method Check point
When the bus-bar voltage exceeds
400V or falls to 50V or below during
compressor operating.
• Replace the power board.
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.
Discharge temperature
thermistor
Defrost thermistor
Ambient temperature
thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Once
• Check the outdoor thermistors.
Twice
3 times
• Replace the outdoor electronic
control P.C. board.
4 times
• Check the outdoor thermistors.9 times
Outdoor heat exchanger
temperature thermistor
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.
5 times
Outdoor control system EEPROM
When nonvolatile memory data cannot
be read properly, unit stops.
• Replace the outdoor electronic
control P.C. board.
Converter control
system
6 times
Communication error
between P.C. boards
• Check the connecting wire
between outdoor electronic
control P.C. board and power board.
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.
Communication between
P.C. boards protection
7 times
Current sensor
Current sensor protection stop is
continuously performed twice.
• Replace the power board.
When a short or open circuit is
detected in the current sensor during
compressor operating.
Current sensor protection
Zero cross detecting circuit
The protection stop of the zero cross detecting
circuit is continuously performed 10 times.
• Check the connecting wire among
electronic control P.C. board,
noise filter P.C. board and power
board.
Zero cross detecting
circuit protection
When zero cross signal cannot be detected
while the compressor is operating.
Goes out
5 times
6 times
Converter protection
Bus-bar voltage protection (1)
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.
Once
3 times
4 times
Lighting
Goes out
Goes out
Goes out
Lighting
IPM protection
Lock protection
Fin temperature overheat
protection
P.C.boad temperature
overheat protection
Discharge temperature
overheat protection
HPS protection
High pressure protection
(Overheat protection)
Low discharge
temperature protection
Outdoor fan protection
Outdoor power system
Overcurrent protection
Fin temperature/P.C.
board temperature
overheat
Refrigerant system
High pressure
protection
Low discharge
temperature
Outdoor fan
Outdoor power
system
When the frequency of the compressor
is kept 80Hz or more and discharge
temperature is kept under 39 for
more than 20 minutes.
When outdoor fan has stopped within
30 seconds 3 times in a row after
outdoor fan start -up,unit stops.
When IPM protection stop or lock protection
stop is continuously performed 3 times within
1 minute after the compressor get started,
or when converter protection stop or bus-bar
voltage protection stop is continuously
performed 3 times within 3 minutes after start-up.
• Check the connection of the
compressor connecting wire.
• Check the inverter/ compressor.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Check the outdoor fan motor.
• Check refrigerant circuit and
refrigerant amount.
• Check the LEV.
• Check the outdoor thermistors.
• Check refrigerant circuit and
refrigerant amount.
• Check the stop valve.
• Check refrigerant circuit and
refrigerant amount.
• Check the LEV.
• Check the outdoor fan motor.
• Reconnect compressor connector.
• Check the inverter/ compressor.
• Check the stop valve.
• Check the PAM module.
When overcurrent is detected after
30 seconds of compressor start-up.
When overcurrent is detected within 30
seconds after the compressor gets started.
When the fin temperature exceeds 87
during operation.
When the P.C. board temperature exceeds
70 during operation.
When discharge temperature exceeds 116.
When high-pressure is detected with the
high-pressure switch (HPS) during operation.
When the indoor coil thermistor (TH5)
exceeds 70 in HEAT mode.
When the outdoor heat exchanger thermistor
exceeds 70 in COOL mode.
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3).
SUZ-KA60VA2.TH
OCH472A