MUZ-GC50NA-
C2
The left lamp of
Abnormal point
OPERATION INDICATOR
(Failure mode / protection)
lamp (Indoor unit)
OFF
None (Normal)
2-time fl ash
Outdoor power system
2.5 seconds
OFF
3-time fl ash
Discharge temperature
2.5 seconds
thermistor
OFF
Defrost thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Ambient temperature
thermistor
4-time fl ash
Overcurrent
2.5 seconds
OFF
Compressor synchronous
abnormality (Compressor
start-up failure protection)
5-time fl ash
Discharge temperature
2.5 seconds
OFF
6-time fl ash
High pressure
2.5 seconds
OFF
7-time fl ash
Fin temperature/ P.C. board
2.5 seconds
temperature
OFF
8-time fl ash
Outdoor fan motor
2.5 seconds
OFF
9-time fl ash
Nonvolatile memory data
2.5 seconds
OFF
10-time fl ash
Discharge temperature
2.5 seconds
OFF
11-time fl ash
DC voltage
2.5 seconds
OFF
Each phase current of
compressor
12-time fl ash
Overcurrent Compressor
2.5 seconds
open-phase
OFF
14-time fl ash
Stop valve (Closed valve)
2.5 seconds
OFF
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (9-3.).
LED indication
(Outdoor P.C. board)
—
Overcurrent protection stop is
continuously performed 3 times within
1 minute after the compressor gets
—
started.
1-time fl ash every
Thermistor shorts or opens during
2.5 seconds
compressor running.
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
2-time fl ash
2.5 seconds OFF
11-time fl ash
Large current fl ows into intelligent
2.5 seconds OFF
power module.
12-time fl ash
Waveform of compressor current is
2.5 seconds OFF
distorted.
Temperature of discharge temperature
thermistor exceeds 116°C, compressor
stops.
Compressor can restart if discharge
—
temperature thermistor reads 100°C or
less 3 minutes later.
Temperature indoor coil thermistor
exceeds 70°C in HEAT mode.
Temperature defrost thermistor
—
exceeds 70°C in COOL mode.
7-time fl ash
Temperature of fi n temperature
2.5 seconds OFF
thermistor on the inverter P.C. board
exceeds 75 ~ 80°C, or temperature of
P.C. board temperature thermistor on
the inverter P.C. board exceeds 70 ~
75°C.
Outdoor fan has stopped 3 times in a
row within 30 seconds after outdoor
—
fan start-up.
5-time fl ash
Nonvolatile memory data cannot be
2.5 seconds OFF
read properly.
Temperature of discharge temperature
thermistor has been 50°C or less for
—
20 minutes.
8-time fl ash
DC voltage of inverter cannot be
2.5 seconds OFF
detected normally.
9-time fl ash
Each phase current of compressor
2.5 seconds OFF
cannot be detected normally.
10-time fl ash
Large current fl ows into intelligent
2.5 seconds OFF
power module (IPM).
The open-phase operation of
compressor is detected.
The interphase short out occurs in the
output of the intelligent power module
(IPM).
The compressor winding shorts out.
14-time fl ash
Closed valve is detected by
2.5 seconds OFF
compressor current.
Condition
Correspondence
—
•
Reconnect connectors.
•
Refer to 9-5. "How
to check inverter/
compressor".
•
Check stop valve.
•
Refer to 9-5.
"Check of outdoor
thermistors".
•
Defective outdoor
thermistors can be
identifi ed by checking
the blinking pattern of
LED.
•
Reconnect compressor
connector.
•
Refer to 9-5. "How
to check inverter/
compressor".
•
Check stop valve.
•
Reconnect compressor
connector.
•
Refer to 9-5. "How
to check inverter/
compressor".
•
Check refrigerant
circuit and refrigerant
amount.
•
Refer to 9-5. "Check
of LEV".
•
Check refrigerant
circuit and refrigerant
amount.
•
Check stop valve.
•
Check around outdoor
unit.
•
Check outdoor unit air
passage.
•
Refer to 9-5. "Check
of outdoor fan motor".
•
Refer to 9-5. "Check
of outdoor fan motor".
Refer to 9-5. "Check
of inverter P.C. board".
•
Replace the inverter
P.C. board.
•
Refer to 9-5. "Check
of LEV".
•
Check refrigerant
circuit and refrigerant
amount.
•
Refer to 9-5. "How
to check inverter/
compressor".
•
Reconnect compressor
connector.
•
Refer to 9-5. "How
to check inverter/
compressor".
•
Check stop valve
29
Indoor/outdoor
Outdoor unit
unit failure
failure mode
mode recall
recall function
function
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