Mitsubishi Electric MXZ-2C30VA Service Manual page 88

MXZ-3C/4C/5C
Upper or left lamp of
Abnormal point
OPERATION INDICATOR
(Failure mode/protection)
lamp (Indoor unit)
None (Normal)
OFF
2-time flash Outdoor power system
3-time flash Discharge temperature
thermistor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
Overcurrent
4-time flash
5-time flash
Discharge temperature
High pressure
6-time flash
Fin temperature
7-time flash
P.C. board temperature
8-time flash
Outdoor fan motor
9-time flash
Nonvolatile memory data
Discharge temperature
10-time flash
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
OBH584G
LED indication
(Outdoor P.C. board) Condition
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 or bus-bar voltage protection
cut-out operates 3 consecutive times
within 3 minutes after start-up.
Lighted Once Thermistor shorts or opens during
compressor running.
Lighted Once
Lighted Twice
Lighted 3 times
Lighted 4 times
Lighted 9 times
Once Not
28 A current flows into intelligent power
lighted
module.
Discharge temperature exceeds 116°C
Lighted Lighted
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.
High-pressure is detected with the
Lighted Lighted
high-pressure switch (HPS)
during operation. (MXZ-3C68/4C71/
4C80/5C100VA, 4C80/5C100VA2)
The outdoor heat exchanger
temperature exceeds 70°C during
cooling or the indoor gas pipe
temperature exceeds 70°C during
heating.
3 times
Not
The fin temperature exceeds 89°C
lighted
during operation.
4 times Not The P.C. board temperature exceeds
lighted 73°C (MXZ-3C54/3C68/4C71VA)/
87°C (MXZ-4C80/5C100VA, 4C80/5C100VA2)
during operation.
Lighted Lighted
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 80Hz or more and the discharge
temperature is kept under
50°C (cooling)/40°C (heating)
for more than 40 minutes.
88
Indoor/outdoor
Remedy
unit failure mode
recall function
• Check the connection
of the compressor
connecting wire.
• Refer to 11-6.
"How to check
inverter/compressor".
• Check the stop valve.
• Refer to 11-6. "Check
of outdoor thermistors".
• Replace the electronic
control P.C. board.
• Refer to 11-6. "Check
of outdoor thermistors".
• Reconnect compressor
connector.
• Refer to 11-6. "How to
check inverter/
compressor".
• Check the stop valve.
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6. "Check
of LEV".
• Check the refrigerant
circuit and the refrigerant
amount.
• Check the stop valve.
• Check around the
outdoor unit.
• Check the outdoor unit
air passage.
• Refer to 11-6. "Check
of outdoor fan motor".
• Refer to 11-6. "Check
of outdoor fan motor".
• Replace the electronic
control P.C. board.
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6. "Check
of LEV".