127
MXZ-3A/4A/5A
LED1(Red) LED2(Yellow)
Lighting
Twice
Outdoor power system
Lighting
3 times
Discharge temperature
thermistor
• Refer to 13-6.
"Check of outdoor thermistors".
• Refer to 13-6. "Check of outdoor thermistors".
Outdoor heat exchanger
temperature thermistor
Defrost thermistor
Lighting
7 times
Nonvolatile memory data
• Replace the outdoor electronic control P.C. board.
Lighting
8 times
Current sensor
• Replace the power board.
Lighting
11 times
Communication error
between P.C. boards
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
Lighting
12 times
Zero cross detecting
circuit
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
Abnormal point / Condition
Correspondence
A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor after 5 minutes (in cooling) and 10
minutes (in heating) of compressor start-up.
A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor after 5 minutes of compressor start-up.
• Replace the outdoor electronic control P.C. board.
Indication
Overcurrent protection stop is continuously performed three times
within 1 minute after the compressor gets started, or converter protection
stop or bus-bar voltage protection stop is continuously performed three
times within 3 minutes after start-up.
A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor after 10 minutes of compressor start-up.
Condition
The nonvolatile memory data cannot be read properly.
Fin temperature
thermistor
P.C board temperature
thermistor
Lighting
4 times
Ambient temperature
thermistor
Current sensor protection stop is continuously performed twice.
Communication error occurs twice between the outdoor electronic control
P.C. board and power board for more than 10 seconds.
The protection stop of the zero cross detecting circuit is continuously
performed 10 times.
A short or open circuit is detected in the thermistor during operation.
A short or open circuit is detected in the thermistor during operation.
5 times
Lighting
IPM protection
Lock protection
3 times
Goes out
Discharge temperature
protection
Fin temperature
protection
P.C. board temperature
protection
High-pressure
protection
8 times
Goes out
Converter protection
• Replace the power board.
Bus-bar voltage
protection (1)
• Check the voltage of power supply.
• Replace the power board or the outdoor electronic
control P.C. board.
• Refer to 13-6. “Check of bus-bar voltage”.
Bus-bar voltage
protection (2)
13 times
Goes out
Outdoor fan motor
• Refer to 13-6. "Check of outdoor fan motor".
Lighting
8 times
Current sensor
protection
• Replace the power board.
Lighting
11 times
Communication protection
between P.C. boards
• Check the connecting wire between outdoor electronic
control P.C. board and power board.
Lighting
12 times
Zero cross detecting circuit
protection
• Check the connecting wire among outdoor electronic
control P.C. board, noise filter P.C. board and power board.
• Check the amount of gas and the refrigerant circuit.
• Check the stop valve.
• Check the amount of gas and refrigerant circuit.
• Refer to 13-6. "Check of LEV".
•Check refrigerant circuit and refrigerant amount.
•Refer to 13-6. "Check of outdoor fan motor".
• Reconnect compressor connector.
• Refer to 13-6.
"How to check inverter/compressor".
• Check the stop valve.
• Check the power module (PAM module).
Twice
Goes out
4 times
Goes out
5 times
Goes out
9 times
Goes out
Overcurrent is detected after 30 minutes of compressor start-up.
Overcurrent is detected within 30 minutes of compressor start-up
The bus-bar voltage exceeds 400 V or falls to 200 V or below during
compressor operating.
The bus-bar voltage exceeds 400 V (MXZ-3A54VA, MXZ-4A71VA)/
430 V (MXZ-4A80VA, MXZ-5A100VA) or falls to 50 V or below during
compressor operating.
Discharge temperature exceeds 116°C during operation. Compressor can
restart if discharge temperature thermistor reads 100°C or less 3 minutes
later.
The fin temperature exceeds 89°C during operation.
The P.C. board temperature exceeds 73°C (MXZ-3A54VA, MXZ-4A71VA)/
87°C (MXZ-4A80VA, MXZ-5A100VA) during operation.
High-pressure is detected with the high-pressure switch (HPS) during
operation. (MXZ-4A80VA, MXZ-5A100VA)
Failure occurs continuously three times within 30 seconds after the fan
gets started.
A short or open circuit is detected in the current sensor during compressor
operating.
Communication error occurs between the outdoor electronic control P.C.
board and power board for more than 10 seconds.
Zero cross signal cannot be detected while the compressor is operating.
The outdoor heat exchanger temperature exceeds 70°C during cooling
or indoor gas pipe temperature exceeds 70°C during heating.
A failure is detected in the operation of the converter during operation.
Outdoor unit
does not
operate.
Lighting
Once
LEV for drain
• Check the connection of the compressor connecting
wire.
• Refer to 13-6.
"How to check inverter/compressor".
• Check the stop valve.
• Refer to 13-6.
"Check of outdoor thermistors".
• Refer to 13-6.
"Check of outdoor thermistors".
• Refer to 13-6.
"Check of LEV".
• Check the drain pump of the indoor unit.
The indoor unit detects any abnormality in the LEV for drain.
Lighting
10 times
Gas pipe temperature
thermistor D
Gas pipe temperature
thermistor A
Gas pipe temperature
thermistor B
Gas pipe temperature
thermistor C
A short or open circuit is detected in the thermistor during cooling.
(A,B,C : MXZ-3A54VA- , , , MXZ-4A71VA- , ,
MXZ-4A80VA- )
(D
: MXZ-4A71VA- , , , MXZ-4A80VA- )
No.
1
2
3
4
5
6
7
8
10
9
11
12
13
14
15
16
17
18
19
20
Symptom
'Outdoor unit
stops and
restarts 3
minutes
later' is
repeated.
E1
E1
E2
E1 E2 E3
E3
E1 E2
E1
E3
Содержание MXZ-2A30VA
Страница 79: ...79 MXZ 3A54VA E7 ...
Страница 83: ...83 MXZ 4A71VA E7 ...
