Mitsubishi Electric Mr.Slim MUZ-GC25NA - C1, Руководство по обслуживанию

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3. Outdoor unit failure mode table
MUZ-GC25/35NA
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 9-5. "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 9-5. "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
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 9-5. "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 9-5. "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 9-5. "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 82 - 83°C, or temperature of
P.C. board temperature thermistor on
the inverter P.C. board exceeds 81 - 85
°C.
•Check around outdoor
unit.
•Check outdoor unit air
passage.
•Refer to 9-5. "Check of
outdoor fan motor".
—
○
9-time fl ash
2.5 seconds OFF
Nonvolatile memory data
—
Nonvolatile memory data cannot be
read properly.
•Replace the inverter
P.C. board.
○ ○
10-time fl ash
2.5 seconds OFF
Discharge temperature 5-time fl ash
2.5 seconds OFF
Temperature of discharge temperature
thermistor has been 50°C or less for 20
minutes.
•Refer to 9-5. "Check of
LEV".
•Check refrigerant circuit
and refrigerant amount.
—
○
11-time fl ash
2.5 seconds OFF
DC voltage
—
DC voltage of inverter cannot be
detected normally.
•Refer to 9-5. "How
to check inverter/
compressor".
—
○
Each phase current of
compressor
8-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
9-time fl ash
2.5 seconds OFF
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 out occurs in the
output of the intelligent power module
(IPM). The compressor winding shorts
out.
•Reconnect compressor
connector.
•Refer to 9-5. "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 (9-3.).