Mitsubishi Electric MXZ-2C30VA, Service Manual

Page: 88 / 396

88
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.
Abnormal point
(Failure mode/protection)
Condition Remedy
Indoor/outdoor
unit failure mode
recall function
LED indication
(Outdoor P.C. board)
LED 1 LED 2
OFF
2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
8-time flash
Lighted Lighted
Lighted Lighted
Lighted Once
Lighted Once
Lighted Twice
Lighted 3 times
Lighted 4 times
Lighted 9 times
Once Not
lighted
Lighted Lighted
Lighted Lighted
3 times
Not
lighted
4 times Not
lighted
Lighted Lighted
Lighted Lighted
Lighted 5 times
9-time flash
10-time flash
• Replace the electronic
control P.C. board.
• Replace the electronic
control P.C. board.
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6.
"Check
of LEV".
• Reconnect compressor
connector.
• Refer to 11-6.
"How to
check inverter/
compressor".
• Check the stop valve.
• Check the refrigerant
circuit and the refrigerant
amount.
• Check the stop valve.
• Refer to 11-6. "Check
of outdoor fan motor".
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6.
"Check
of LEV".
• Check around the
outdoor unit.
• Check the outdoor unit
air passage.
• Refer to 11-6.
"Check
of outdoor fan motor".
• 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".
• Refer to 11-6. "Check
of outdoor thermistors".
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.
Thermistor shorts or opens during
compressor running.
28 A current flows into intelligent power
module.
Discharge temperature exceeds 116°C
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.
High-pressure is detected with the
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.
The fin temperature exceeds 89°C
during operation.
The P.C. board temperature exceeds
73°C (
MXZ-3C54/3C68/4C71VA
)/
87°C (
MXZ-4C80/5C100VA, 4C80/5C100VA2
)
during operation.
Failure occurs 3 consecutive
times within 30 seconds after the
fan gets started.
Nonvolatile memory data cannot be
read properly.
Outdoor power system
Discharge temperature
thermistor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Overcurrent
Discharge temperature
High pressure
Fin temperature
P.C. board temperature
Outdoor fan motor
Nonvolatile memory data
Discharge temperature
None (Normal)
Upper or left lamp of
OPERATION INDICATOR
lamp (Indoor unit)
Outdoor heat exchanger
temperature thermistor
NOTE
: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
MXZ-3C/4C/5C
OBH584G