Mitsubishi Electric MXZ-3C30NA Service Manual page 70

3. Table of outdoor unit failure mode recall function
The left lamp of
OPERATION IN- Abnormal point
DICATOR lamp (Failure mode/protection)
(Indoor unit)
OFF None (Normal)
2-time fl ash Outdoor power system
3-time fl ash Discharge temperature thermistor Lighted
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature thermistor Lighted 4 times
Outdoor heat exchanger tem-
perature thermistor
4-time fl ash Overcurrent
5-time fl ash Discharge temperature
6-time fl ash High pressure
7-time fl ash Fin temperature
P.C. board temperature
8-time fl ash Outdoor fan motor
9-time fl ash Outdoor control system
10-time fl ash Low discharge temperature
protection
11-time fl ash Communication error
between P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage
15-time fl ash LEV and drain pump
OBH702E
LED indication
(Outdoor P.C.
board)
LED 1 LED 2
Lighted Lighted
Lighted Lighted Overcurrent protection cut-out operates
3 consecutive times within 1 minute after
the compressor gets started, or converter
protection cut-out or bus-bar voltage
protection cut-out operates 3 consecutive
times within 3 minutes after startup.
Once A thermistor shorts or opens during
compressor running.
Lighted Once
Lighted Twice
Lighted 3 times
Lighted 9 times
Once Not 21 A (MXZ-3C24/3C30/4C36NA, MXZ-3C24/
lighted 3C30/4C36NA2)/28 A (MXZ-5C42NA, MXZ-
2C20/3C24/3C30NAHZ, MXZ-5C42NA2,
MXZ-2C20/3C24/3C30NAHZ2) current flows
into power module.
Lighted Lighted The discharge temperature exceeds 222.8°F
(MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/
4C36NA2)/240.8°F (MXZ-2C20/3C24/3C30
NAHZ, 5C42NA, MXZ-2C20/3C24/3C30
NAHZ2, 5C42NA2) during operation.
Compressor can restart if discharge tempera-
ture thermistor reads 203°F (MXZ-3C24/3C30
/4C36NA, MXZ-3C24/3C30/4C36NA2)/212°F
(MXZ-2C20/3C24/3C30NAHZ, 5C42NA,
MXZ-2C20/3C24/3C30NAHZ2, 5C42NA2) or
less 3 minutes later.
Lighted Lighted The outdoor heat exchanger temperature ex-
ceeds 158°F during cooling or the indoor gas
pipe temperature exceeds 158°F during heating.
3 times Not The fin temperature exceeds 190°F (MXZ-
lighted 3C24/3C30/4C36NA, MXZ-3C24/3C30/
4C36NA2)/192°F (MXZ-2C20/3C24/
3C30NAHZ, 5C42NA, MXZ-2C20/3C24/3C30
NAHZ2, 5C42NA2) during operation.
4 times Not The P.C. board temperature exceeds 152°F
lighted (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/
4C36NA2)/189°F (MXZ-2C20/3C24/3C30
NAHZ, 5C42NA, MXZ-2C20/3C24/3C30
NAHZ2, 5C42NA2) during operation.
Lighted Lighted A failure occurs 3 consecutive times within
30 seconds after the fan gets started.
Lighted 5 times Nonvolatile memory data cannot be read
properly.
Lighted Lighted The frequency of the compressor is kept 80
Hz or more and the discharge temperature is
kept under 102.2°F for more than 20 minutes.
Lighted 6 times Communication error occurs between the out-
door control P.C. board and outdoor power P.C.
board for more than 10 seconds.
The communication between boards protec-
tion cut-out operates 2 consecutive times.
Lighted 7 times A short or open circuit is detected in the cur-
rent sensor during compressor operating.
Current sensor protection cut-out oper-
ates 2 consecutive times.
5 times Not Zero cross signal cannot be detected
lighted while the compressor is operating.
The protection cut-out of the zero cross de-
tecting circuit operates 10 consecutive times.
5 times Not A failure is detected in the operation of the
lighted converter during operation.
6 times Not The bus-bar voltage exceeds 400 V or
lighted falls to low level during compressor oper-
ating.
Lighted Lighted The indoor unit detects an abnormality in
the LEV and drain pump.
70
NOTE: Blinking patterns of this mode differ from the ones of
TROUBLESHOOTING CHECK TABLE (11-4.).
Condition
• Check the connection of the com-
pressor connecting wire.
• Refer to 11-6.
"How to check inverter/compres-
sor".
• Check the stop valve.
• Refer to 11-6.
thermistors".
• Replace the outdoor control P.C. board.
• Refer to 11-6.
thermistors".
• Reconnect compressor connector.
• Refer to 11-6.
verter/compressor".
• Check the stop valve.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-6.
• Check refrigerant circuit and refrig-
erant amount.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-6.
fan motor".
• Refer to 11-6.
fan motor".
• Replace the outdoor control P.C.
board.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-6.
• Check the connecting wire between
outdoor control P.C. board and out-
door power P.C. board.
• Check the connecting wire among
outdoor control P.C. board and out-
door power P.C. board.
• Check the voltage of power supply.
• Replace the outdoor power P.C.
board.
• Check the voltage of power supply.
• Replace the outdoor control P.C.
board.
• Refer to 11-6.
• Check the drain pump of the indoor unit.
Indoor/
outdoor unit
Remedy
failure mode
recall function
○
"Check of outdoor
○
"Check of outdoor
"How to check in-
—
"Check of LEV".
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"Check of outdoor
"Check of outdoor
—
○
—
"Check of LEV".
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○
—
—
○
—
○
—
"Check of LEV".
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