Mitsubishi Electric MXZ-2C30VA, Руководство по обслуживанию

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96
MXZ-6C
No. Symptom
Indication
Abnormal point / Con-
dition
Condition Remedy
LED1(Red) LED2(Yellow)
1 Outdoor
unit does
not operate.
Lighted Once LEV and drain pump
The indoor unit detects an abnormality in the LEV
and drain pump. • Refer to 11-6. "Check of LEV".
• Check the drain pump of the indoor unit.
2
Lighted Twice
Outdoor power
system
Overcurrent protection cut-out operates 3 consecu-
tive times, bus-bar voltage protection cut-out oper-
ates 3 consecutive times, or primary current protec-
tion cut-out operates 3 consecutive times within
1 minute after the compressor gets started. • Check the connection of the compressor connect-
ing wire.
• Refer to 11-6. "How to check inverter/compres-
sor".
• Check the stop valve.
3
Lighted 3 times
Discharge
temperature
thermistor A short circuit is detected in the thermistor during op-
eration, or an open circuit is detected in the thermistor
10 minutes after compressor start-up. • Refer to 11-6. "Check of outdoor
thermistors".
4
Lighted 4 times
Fin temperature
thermistor A short or open circuit is detected in the
thermistor during operation. • Replace the power board
(MXZ-6C120VA)
/out-
door power P.C. board
(MXZ-6C122VA)
.
P.C board
temperature
thermistor • Replace the power board
(MXZ-6C120VA)
/out-
door power P.C. board
(MXZ-6C122VA)
.
5
Lighted 5 times
Ambient temperature
thermistor A short or open circuit is detected in the
thermistor during operation. • Refer to 11-6. "Check of outdoor
thermistors".
Outdoor heat
exchanger
temperature
thermistor
Defrost thermistor
6
Lighted 7 times
Nonvolatile memory
data (Outdoor control
P.C. board) The nonvolatile memory data cannot be read prop-
erly. • Replace the control P.C. board
(MXZ-6C120VA)
/
outdoor control P.C. board
(MXZ-6C122VA).
7
Lighted 8 times Current sensor
Current sensor has been short or open circuited
for 120 seconds. • Replace the power board
(MXZ-6C120VA)
/out-
door power P.C. board
(MXZ-6C122VA)
.
8
Lighted 11 times
Communication error
between P.C. boards
Communication error occurs twice between the
outdoor control P.C. board and power board
(MXZ-
6C120VA)
/outdoor power P.C. board
(MXZ-
6C122VA)
for more than 10 seconds.
• Check the connecting wire between control P.C.
board
(MXZ-6C120VA)
/outdoor control P.C.
board
(MXZ-6C122VA)
and the power board
(MXZ-6C120VA)
/outdoor power P.C. board
(MXZ-6C122VA)
.
9
Lighted 12 times
Zero cross detecting
circuit
The protection cut-out of the zero cross detecting
circuit operates 3 consecutive times. • Check the connecting wire between control P.C.
board
(MXZ-6C120VA)
/outdoor control P.C.
board
(MXZ-6C122VA)
and the power board
(MXZ-6C120VA)
/outdoor power P.C. board
(MXZ-6C122VA)
.
Lighted 14 times
Nonvolatile memory
data (power board
(MXZ-
6C120VA)
/outdoor power
P.C. board
(MXZ-6C122VA)
)
The nonvolatile memory data cannot be read prop-
erly. • Replace the power board
(MXZ-6C120VA)
/out-
door power P.C. board
(MXZ-6C122VA)
.
10 'Outdoor
unit stops
and restarts
3 minutes
later' is
repeated.
Twice Not lighted
IPM protection
Overcurrent is detected when the frequency of the
compressor is 1 Hz or less. • Reconnect compressor connector.
• Refer to 11-6. "How to check inverter/
compressor".
• Check the stop valve.
• Check the power module (PAM module).
Overcurrent
Overcurrent is detected when the frequency
of the compressor is more than 1 Hz.
11
3 times Not lighted
Discharge
temperature
protection
Discharge temperature exceeds 114°C during op-
eration. Compressor can restart if discharge tem-
perature thermistor reads 100°C or less 3 minutes
later. • Check the amount of gas and refrigerant
circuit.
• Refer to 11-6. "Check of LEV".
12
4 times Not lighted
Fin temperature
protection The fi n temperature exceeds 110°C during opera-
tion.
•Check the refrigerant circuit and the refrigerant
amount.
P.C. board
temperature
protection The P.C. board temperature exceeds 95°C during
operation.
13
5 times Not lighted
High-pressure
protection
High-pressure is detected with the high-pressure
switch (HPS) during operation. • Check the amount of gas and the
refrigerant circuit.
• Check the stop valve.
The outdoor heat exchanger temperature exceeds
70°C during cooling or indoor gas pipe tempera-
ture exceeds 70°C during heating.
7 times Not lighted
Out-of-step
protection
The waveform of compressor current is distorted. • Reconnect connector of compressor.
• Refer to 11-6. "How to check inverter/
compressor".
15
9 times Not lighted
Bus-bar voltage
protection
The bus-bar voltage exceeds 400 V or falls to
300 V or below while the compressor is
operating. • Check the voltage of power supply.
• Replace the power board
(MXZ-6C120VA)
/out-
door power P.C. board
(MXZ-6C122VA)
or the
control P.C. board
(MXZ-6C120VA)
/outdoor con-
trol P.C. board
(MXZ-6C122VA)
.
• Refer to 11-6. “Check of bus-bar voltage”.
10 times Not lighted Zero cross loss
Zero cross signal cannot be detected while the
compressor is operating.
11 times Not lighted
Low out side
temperature
protection (cooling) The ambient temperature became -12°C or less.
12 times Not lighted
Primary current
protection The primary current exceeds 37 A for 10
seconds.
16
13 times Not lighted Outdoor fan motor
The fan motor speed is 50 rpm or less or 1500 rpm
or more for 1 minute, or the fan motor speed is 100
rpm or less for 15 seconds when the outside tem-
perature is 20 °C or more. • Refer to 11-6. "Check of outdoor fan motor".
OBH584G