Mitsubishi Electric MUZ-EF25VE, Руководство по обслуживанию

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3. Outdoor unit failure mode table
The left
lamp of
OPERATION
INDICATOR
lamp
(Indoor unit)
Abnormal point
(Failure mode/protection)
LED indication
(Outdoor P.C. board)
Condition Remedy
Indoor/outdoor
unit failure
mode recall
function
Outdoor unit
failure mode
recall function
OFF None (Normal) — — — — —
1-time fl ash
2.5 seconds
OFF Indoor/outdoor
communication, receiving
error
—
Any signals from the inverter P.C.
board cannot be received normally for
3 minutes. •Refer to 11-5. How
to check miswiring and
serial signal error.
○ ○
Indoor/outdoor
communication, receiving
error
—
Although the inverter P.C. board sends
signal "0", signal "1" has been received
30 consecutive times. •Refer to 11-5. How
to check miswiring and
serial signal error.
2-time fl ash
2.5 seconds
OFF Outdoor power system
—
Overcurrent protection cut-out
operates 3 consecutive times within
1 minute after the compressor gets
started.
• Reconnect
connectors.
• Refer to 11-5. "How
to check inverter/
compressor".
• Check the 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
identifi 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 the 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 the refrigerant
circuit and the
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 the refrigerant
circuit and the
refrigerant amount.
• Check the 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 ~ 86°C, or temperature of
P.C. board temperature thermistor on
the inverter P.C. board exceeds 72 ~
85°C.
• Check the around
outdoor unit.
• Check the 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 interface short circuit occurs in the
output of the intelligent power module
(IC700).
The compressor winding shorts circuit.
• Refer to 11-5. "How
to check inverter/
compressor".
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).
OBH590G