Mitsubishi Electric MXZ-2A30VA - E1 Service Manual page 127

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