Mitsubishi Electric MXZ-2HA40VF-E1 Service Manual page 44

MXZ-3HA
The left lamp of
OPERATION IN- Abnormal point
DICATOR lamp (Failure mode/protection)
(Indoor unit)
OFF None (Normal)
2-time blink Outdoor power system
3-time blink Discharge temperature thermistor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature thermis-
tor
Outdoor heat exchanger tem-
perature thermistor
4-time blink Overcurrent
5-time blink Discharge temperature
6-time blink High pressure
7-time blink Fin temperature
P.C. board temperature
8-time blink Outdoor fan motor
9-time blink Outdoor control system
10-time blink Low discharge temperature
protection
11-time blink Communication error
between P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage
15-time blink LEV and drain pump
OBH828B
NOTE: Blinking patterns of this mode differ from the ones of
LED indication
(Outdoor P.C.
Condition
board)
LED1 LED2
Lit Lit
Lit Lit Overcurrent protection cut-out operates 3 con-
secutive times within 1 minute after the com-
pressor gets started, or converter protection
cut-out or bus-bar voltage protection cut-out
operates 3 consecutive times within 3 minutes
after startup.
Lit Once A thermistor shorts or opens during
compressor running.
Lit Once
Lit Twice
Lit 3 times
Lit 4 times
Lit 9 times
Once Not lit 21 A current flows into power module.
Lit Lit The discharge temperature exceeds 115°C
during operation.
Compressor can restart if discharge tempera-
ture thermistor reads 80°C or less 3 minutes
later.
Lit Lit The outdoor heat exchanger temperature ex-
ceeds 70°C during cooling or the indoor gas pipe
temperature exceeds 70°C during heating.
3 times Not lit The fin temperature exceeds 88°C during op-
eration.
4 times Not lit The P.C. board temperature exceeds 67°C
during operation.
Lit Lit A failure occurs 3 consecutive times within 30
seconds after the fan gets started.
Lit 5 times Nonvolatile memory data cannot be read prop-
erly.
Lit Lit The frequency of the compressor is kept 80 Hz
or more and the discharge temperature is kept
under 39°C for more than 20 minutes.
Lit 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.
Lit 7 times A short or open circuit is detected in the cur-
rent sensor during compressor operating.
Current sensor protection cut-out operates 2
consecutive times.
5 times Not lit Zero cross signal cannot be detected while the
compressor is operating.
The protection cut-out of the zero cross
detecting circuit operates 10 consecutive
times.
5 times Not lit A failure is detected in the operation of the
converter during operation.
5 times Not lit The bus-bar voltage exceeds 400 V or falls to
low level during compressor operating.
Lit Lit The indoor unit detects an abnormality in
the LEV and drain pump.
44
Troubleshooting check table (12-4.).
Remedy
• Check the connection of the com-
pressor connecting wire.
• Refer to 12-6.
"How to check inverter/compres-
sor".
• Check the stop valve.
• Refer to 12-6.
thermistors".
• Replace the outdoor control P.C.
board.
• Refer to 12-6.
thermistors".
• Reconnect compressor connector.
• Refer to 12-6.
verter/compressor".
• Check the stop valve.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 12-6. "Check of LEV".
• Check refrigerant circuit and refrig-
erant amount.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 12-6.
fan motor".
• Refer to 12-6.
fan motor".
• Replace the outdoor control P.C. board.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 12-6. "Check of LEV".
• Check the connecting wire between
outdoor control P.C. board and out-
door power P.C. board.
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• 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 12-6. "Check of LEV".
• Check the drain pump of the indoor
unit.
Indoor/
outdoor unit
failure mode
recall function
○
"Check of outdoor
○
"Check of outdoor
"How to check in-
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"Check of outdoor
"Check of outdoor
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