Mitsubishi SUZ-KA35VA Service Manual page 66

SUZ-KA50VA SUZ-KA60VA SUZ-KA71VA (Except for SUZ-KA50VAR2.TH)
Indication
Symptom
No.
LED1 (Red) LED2 (Yellow)
Outdoor unit
does not
1
operate.
Lightning Twice
Lightning 3 times
2
Lightning 4 times
3
4
Lightning 5 times
Lightning 6 times
5
6
Lightning 7 times
7
Lightning 8 times
8 Lightning 11 times
9
Lightning 12 times
'Outdoor unit
stops and
restarts 3
Twice Goes out
minutes later'
10
is repeated.
11 3 times Goes out
12 4 times Goes out
13 5 times Goes out
Goes out
14 8 times
15 9 times Goes out
16
13 times Goes out
17 Lighting 8 times
Lighting 11 times
18
Lighting 12 times
19
NOTE 1. The location of LED is illustrated at the right figure.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is "2".
ON
2.5-second OFF
OFF
OC322G
Abnormal point/Condition
When IPM protection stop or lock protection stop is continuously
performed three times within 1 minute after the compressor gets
started, or when converter protection stop or bus-bar voltage
Outdoor power system
protection stop is continuously performed three times within 3 minutes
after start-up.
When a short circuit is detected in the thermistor during operation, or
Discharge temperature
when an open circuit is detected in the thermistor after 10 minutes
thermistor
of compressor start-up.
Fin temperature thermistor
When a short or open circuit is detected in the thermistor
during operation.
P.C board temperature
thermistor
Ambient temperature When a short or open circuit is detected in the thermistor
thermistor during operation.
When a short circuit is detected in the thermistor during operation, or
Outdoor heat exchanger
when an open circuit is detected in the thermistor after 5 minutes
temperature thermistor
(in cooling) and 10 minutes (in heating) 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
Defrost thermistor
compressor start-up.
When the communication fails between the indoor and outdoor unit
Serial signal
for 3 minutes.
Nonvolatile memory data When the nonvolatile memory data cannot be read properly.
Current sensor Current sensor protection stop is continuously performed twice.
When the communication protection stop between boards is
Communication error
between P.C. boards continuously performed twice.
The protection stop of the zero cross detecting circuit is
Zero cross detecting
continuously performed 10 times.
circuit
When over-current is detected after 30 seconds of compressor
IPM protection
start-up.
When over-current is detected within 30 seconds of
Lock protection
compressor start-up.
When temperature of discharge temperature thermistor exceeds 116:,
Discharge temperature
compressor stops. Compressor can restart if discharge temperature
protection
thermistor reads 100
When the fin temperature exceeds 87
Fin temperature protection
P.C. board temperature
When the P.C. board temperature exceeds 70
protection
When high-pressure is detected with the high-pressure switch (HPS)
during operation.
High-pressure protection
When the outdoor heat exchanger temperature exceeds 70
cooling or when indoor gas pipe temperature exceeds 70
heating.
When a failure is detected in the operation of the converter
Converter protection
during operation.
Bus-bar voltage When the bus-bar voltage exceeds 400V or falls to 200V or below
protection (1) during compressor operating.
Bus-bar voltage
When the bus-bar voltage exceeds 400V or falls to 50V or below
protection (2)
during compressor operating.
When failure occurs continuously three times within 30 seconds after
Outdoor fan motor
the fan gets started.
When a short or open circuit is detected in the current sensor during
Current sensor protection
compressor operating.
Communication error occurs between the outdoor electronic control
Communication between
P.C. boards protection P.C. board and power board for more than 10 seconds.
When zero cross signal cannot be detected while the compressor is
Zero cross detecting
operating.
circuit protection
0.5-second ON
Condition
or less 3 minutes later.
during operation.
during operation.
2.5-second OFF
66
Correspondence
• Check the connection of the compressor
connecting wire.
• Refer to 12-5. "How to check inverter/
compressor".
• Check the stop valve.
• Refer to 12-5. "Check of outdoor thermistor".
• Refer to 12-5. "Check of outdoor thermistor".
• Replace the outdoor electronic control P.C.
board.
• Refer to 12-5. "Check of outdoor thermistor".
Refer to 12-5. "How to check mis-wiring and
serial signal error".
• Replace the outdoor electronic control P.C. board.
• Replace the power board.
• Check the connecting wire between outdoor
electronic control P.C. board and power board.
• Check the connecting wire among outdoor
electronic control P.C. board, noise filter P.C.
board and power board.
• Reconnect compressor connector.
• Refer to 12-5. "How to check inverter/
compressor".
• Check the stop valve.
• Check the power module (PAM module).
• Check the amount of gas and refrigerant circuit.
• Refer to 12-5. "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
• Refer to 12-5. "Check of LEV".
• Check around of gas and the refrigerant circuit.
• Check of stop valve.
during
during
• Replace the power board.
• Replace the power board.
• Refer to 12-5. "Check of outdoor fan motor".
• Replace the power board.
• Check the connecting wire between outdoor
electronic control P.C. board and power board.
• Check the connecting wire among outdoor
electronic control P.C. board, noise filter
P.C. board and power board.
Outdoor electronic control P.C. board (Parts side)
Lighting
0.5-second ON
LED2 LED1