Mitsubishi SUZ-KA35VA Service Manual page 63

Outdoor LED indication Abnormal point
(Failure mode)
LED1 LED2
Once Goes out
Overcurrent protection
3 times Goes out
Fin temperature/P.C.
board temperature
overheat
4 times Goes out
Lighting Lighting
Refrigerant system
High pressure
protection
Low discharge
temperature
Outdoor fan
Outdoor power
system
OC322G
Details of abnormal
When overcurrent is detected after
IPM protection
30 seconds of compressor start-up.
When overcurrent is detected within
Lock protection
30 seconds after the compressor
gets started.
When the fin temperature exceeds 87
Fin temperature overheat
during operation.
protection
When the P.C. board temperature
P.C.boad temperature
exceeds 70
overheat protection
When discharge temperature exceeds
Discharge temperature
116 .
overheat protection
When high-pressure is detected with the
HPS protection
high-pressure switch (HPS) during operation.
When the indoor coil thermistor (TH5)
High pressure protection
exceeds 70
(Overheat protection)
When the outdoor heat exchanger thermistor
exceeds 70
When the frequency of the compressor
Low discharge
is kept 80Hz or more and discharge
temperature protection
temperature is kept under 39
more than 20 minutes.
When outdoor fan has stopped within
Outdoor fan protection
30 seconds 3 times in a row after
outdoor fan start -up,unit stops.
When IPM protection stop or lock
Outdoor power system
protection stop is continuously
performed 3 times within 1 minute after
the compressor get started, or when
converter protection stop or bus-bar
voltage protection stop is continuously
performed 3 times within 3 minutes
after start-up.
63
Detecting method
during operation.
in HEAT mode.
in COOL mode.
for
Check point
• Check the connection of the
compressor connecting wire.
• Check the inverter/ compressor.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Check the outdoor fan motor.
• Check refrigerant circuit and
refrigerant amount.
• Check the LEV.
• Check the outdoor thermistors.
• Check refrigerant circuit and
refrigerant amount.
• Check the stop valve.
• Check refrigerant circuit and
refrigerant amount.
• Check the LEV.
• Check the outdoor fan motor.
• Reconnect compressor connector.
• Check the inverter/ compressor.
• Check the stop valve.
• Check the PAM module.