Mitsubishi Electric MUZ-DM25VA, 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 Remedy
Indoor/outdoor
unit failure
mode recall
function
Outdoor unit
failure mode
recall function
OFF None (Normal) — — — — —
1-time f 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 f 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 stop valve.
○ ○
3-time f ash
2.5 seconds
OFF
Discharge temperature
thermistor
1-time f 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
identif ed by checking
the blinking pattern of
LED.
○ ○
Defrost thermistor
Fin temperature thermistor 3-time f ash
2.5 seconds OFF
P.C. board temperature
thermistor
4-time f ash
2.5 seconds OFF
4-time f ash
2.5 seconds
OFF
Overcurrent 11-time f ash
2.5 seconds OFF
Large current f ows into 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 f 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 f 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 f ash
2.5 seconds
OFF
High pressure
—
Temperature of indoor coil thermistor
exceeds 70°C in HEAT mode.
Temperature of defrost thermistor
exceeds 70°C in COOL mode.
• Check refrigerant
circuit and refrigerant
amount.
• Check stop valve.
—
○
7-time f ash
2.5 seconds
OFF
Fin temperature/ P.C. board
temperature
7-time f ash
2.5 seconds OFF
Temperature of f n temperature
thermistor on the inverter P.C. board
exceeds 80°C or temperature of P.C.
board temperature thermistor on the
inverter P.C. board exceeds 78°C.
• Check around outdoor
unit.
• Check outdoor unit air
passage.
• Refer to 11-5. "Check
of outdoor fan motor".
—
○
9-time f ash
2.5 seconds
OFF
Nonvolatile memory data 5-time f ash
2.5 seconds OFF
Nonvolatile memory data cannot be
read properly.
• Replace the inverter
P.C. board.
○ ○
Power module 6-time f ash
2.5 seconds OFF
The interface short circuit occurs in the
output of the power module (IC700).
The compressor winding shorts circuit.
• Refer to 11-5. "How
to check inverter/
compressor".
10-time f 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.
—
○
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.).
OBH751