Mitsubishi Electric SUZ-KA25VA Technical & Service Manual page 58

SUZ-KA50VA .TH SUZ-KA60VA
(1)
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
5 Lightning 6 times
6
Lightning 7 times
7
Lightning 8 times
Lightning 11 times
8
9
Lightning 12 times
'Outdoor unit
stops and
restarts 3
minutes
Twice Goes out
10
later' is
repeated.
3 times Goes out
11
12 4 times Goes out
13 5 times Goes out
14 8 times Goes out
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
.TH SUZ-KA71VA
(1)
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 during
thermistor 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 (in
temperature thermistor
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
Serial signal
unit for 3 minutes.
When the nonvolatile memory data cannot be read properly.
Nonvolatile memory data
Current sensor protection stop is continuously performed twice.
Current sensor
When the communication protection stop between boards is
Communication error
continuously performed twice.
between P.C. boards
The protection stop of the zero cross detecting circuit is continuously
Zero cross detecting
performed 10 times.
circuit
IPM protection When over-current is detected after 30 minutes of compressor start-up.
When over-current is detected within 30 minutes of compressor
Lock protection
start-up
Discharge temperature When temperature of discharge temperature thermistor exceeds
protection compressor stops. Compressor can restart if discharge temperature
thermistor reads 100: or less 3 minutes later.
Fin temperature
When the fin temperature exceeds 87: during operation.
protection
P.C. board temperature
When the P.C. board temperature exceeds 70: during operation.
protection
High-pressure
When high-pressure is detected with the high-pressure switch (HPS)
protection
during operation.
When the outdoor heat exchanger temperature exceeds 70:
during cooling or when indoor gas pipe temperature exceeds 70:
during heating.
When a failure is detected in the operation of the converter during
Converter protection
operation.
When the bus-bar voltage exceeds 400V or falls to 200V or below
Bus-bar voltage
protection (1) during compressor operating.
Bus-bar voltage When the bus-bar voltage exceeds 400V or falls to 50V or below
during compressor operating.
protection (2)
When failure occurs continuously three times within 30 seconds after
Outdoor fan motor
the fan gets started.
Current sensor When a short or open circuit is detected in the current sensor during
protection compressor operating.
Communication error occurs between the outdoor electronic control P.C.
Communication between P.C.
board and power board for more than 10 seconds.
boards protection
When zero cross signal cannot be detected while the compressor is
Zero cross detecting circuit
operating.
protection
.TH
(1)
Condition
0.5-second ON
2.5-second OFF
58
Correspondence
• Check the connection of the compressor connecting
wire.
• Refer to 12-5.U "How to check inverter/compressor".
• Check the stop valve.
• Refer to 12-5.V "Check of outdoor thirmistor".
• Refer to 12-5.V "Check of outdoor thirmistor".
• Replace the outdoor electronic control P.C. board.
• Refer to 12-5.V "Check of outdoor thirmistor".
Refer to 12-5.R "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.U "How to check inverter/compressor".
• Check the stop valve.
• Check the power module (PAM module).
116:, • Check the amount of gas and refrigerant circuit.
• Refer to 12-5.T "Check of LEV".
•Check refrigerant circuit and refrigerant amount.
•Refer to 12-5.T "Check of LEV".
• Check around of gas and the refrigerant circuit.
• Check of stop valve.
• Replace the power board.
• Replace the power board.
• Refer to 12-5.W "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)
0.5-second ON
LED2 LED1
Lighting