Mitsubishi Electric MUZ-GE25VA, Руководство по обслуживанию

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