Mitsubishi Electric Mr.Slim MUZ-GC25NA - C1 Service Manual page 31

MUZ-GC50NA-
C1
Indication
No. Symptom
LED1 LED2
(Red) (Yellow)
Outdoor unit Lightning Twice
does not op-
1 erate.
Lightning 3 times
2
Lightning 4 times
3
Lightning 5 times
4
Lightning 6 times
5
Lightning 7 times
6
Lightning 8 times
7
Lightning 11 times Communication error
8
Lightning 12 times
9
Outdoor unit Twice Goes out
stops and
restarts 3
minutes later'
10
is repeated.
3 times Goes out Discharge temperature
11
4 times Goes out Fin temperature protec-
12
5 times Goes out High-pressure protec-
13
8 times Goes out Converter protection
14
9 times Goes out Bus-bar voltage protec-
15
13 times Goes out Outdoor fan motor
16
Lighting 8 times
17
Lighting 11 times Communication be-
18
Lighting 12 times Zero cross detecting
19
NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 9-6.2.
2. LED is lighted during normal operation.
The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the fl ashing frequency is "2".
ON
2.5-second OFF
OFF
MUZ-GC60/71NA
Abnormal point /
Condition
Overcurrent protection stop is continuously performed 3 times
within 1 minute after the compressor gets started, or when
Outdoor power system converter protection stop or bus-bar voltage protection stop is
continuously performed 3 times within 3 minutes after start-up.
A short circuit is detected in the thermistor during operation, or
Discharge temperature
when an open circuit is detected in the thermistor after 10 min-
thermistor
utes of compressor start-up.
Fin temperature ther-
mistor
A short or open circuit is detected in the thermistor during op-
eration.
P.C board temperature
thermistor
Ambient temperature A short or open circuit is detected in the thermistor during op-
thermistor eration.
A short circuit is detected in the thermistor during operation, or
Outdoor heat exchanger
an open circuit is detected in the thermistor after 5 minutes (in
temperature thermistor
cooling) and 10 minutes (in heating) of compressor start-up.
A short circuit is detected in the thermistor during operation, or
Defrost thermistor an open circuit is detected in the thermistor after 5 minutes of
compressor start-up.
The communication fails between the indoor and outdoor unit
Serial signal
for 3 minutes.
Nonvolatile memory
The nonvolatile memory data cannot be read properly.
data
Current sensor Current sensor protection stop is continuously performed twice. • Replace the power board.
The communication protection stop between boards is continu-
between P.C. boards ously performed twice.
The protection stop of the zero cross detecting circuit is con-
Zero cross detecting tinuously performed 10 times.
circuit
Over-current is detected after 30 minutes of compressor start-
IPM protection
up.
Over-current is detected within 30 minutes of compressor start-
Lock protection
up.
Discharge temperature exceeds 116°C during operation and
compressor stops. Compressor can restart if discharge tem-
protection
perature thermistor reads 100°C or less 3 minutes later.
The fi n temperature exceeds 87°C during operation.
tion
P.C. board temperature
The P.C. board temperature exceeds 70°C during operation.
protection
High-pressure is detected with the high-pressure switch (HPS)
tion during operation.
The outdoor heat exchanger temperature exceeds 70°C during
cooling or indoor gas pipe temperature exceeds 70°C during
heating.
A failure is detected in the operation of the converter during op-
eration.
The bus-bar voltage exceeds 400 V or falls to 200 V or below
tion (1) during compressor operating.
Bus-bar voltage protec- The bus-bar voltage exceeds 400 V or falls to 50 V or below
tion (2) during compressor operating.
Failure occurs continuously 3 times within 30 seconds after the
fan gets started.
Current sensor protec- A short or open circuit is detected in the current sensor during
tion compressor operating.
Communication error occurs between the outdoor electronic
tween P.C. boards pro- control P.C. board and power board for more than 10 seconds.
tection
circuit protection Zero cross signal cannot be detected while the compressor is
operating.
Condition
0.5-second ON
2.5-second OFF
31
Correspondence
• Check the connection of the com-
pressor connecting wire.
• Refer to 9-5. "How to check in-
verter/compressor".
• Check the stop valve.
• Refer to 9-5. "Check of outdoor
thermistor".
• Refer to 9-5. "Check of outdoor
thermistor".
• Replace the outdoor electronic
control P.C. board.
• Refer to 9-5. "Check of outdoor
thermistor".
• Refer to 9-5. "How to check mis-
wiring and serial signal error.
• Replace the outdoor electronic
control P.C. board.
• Check the connecting wire be-
tween outdoor electronic control
P.C. board and power board.
• Check the connecting wire among
outdoor electronic control P.C.
board, noise fi lter P.C. board and
power board.
• Reconnect compressor connector.
• Refer to 9-5. "How to check in-
verter/compressor".
• Check the stop valve.
• Check the power module (PAM
module).
• Check the amount of gas and re-
frigerant circuit.
• Refer to 9-5. "Check of LEV".
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 9-5. "Check of outdoor
fan motor".
• Check around of gas and the re-
frigerant circuit.
• Check of stop valve.
• Replace the power board.
• Replace the power board.
• Refer to 9-5. "Check of outdoor
fan motor".
• Replace the power board.
• Check the connecting wire be-
tween outdoor electronic control
P.C. board and power board.
• Check the connecting wire among
outdoor electronic control P.C.
board, noise fi lter P.C. board and
power board.
Outdoor electronic control P.C. board(Parts side)
Lighting
0.5-second ON
LED2 LED1