101
UPPER 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 flash
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 12-5. 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 12-5. How
to check miswiring and
serial signal error.
2-time flash
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 12-5. “How to check
inverter/compressor”.
Check stop valve.
3-time flash
2.5 seconds OFF
Discharge temperature
thermistor
1-time flash every 2.5
seconds
Thermistor shorts or opens
during
compressor running.
Refer to 12-5.
“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 flash
2.5 seconds OFF
P.C. board temperature
thermistor
4-time flash
2.5 seconds OFF
Ambient temperature
thermistor
2-time flash
2.5 seconds OFF
Outdoor heat exchanger
temperature thermistor
-
4-time flash
2.5 seconds OFF
Overcurrent
11-time flash
2.5 seconds OFF
Large current fl ows into power
module
(IC700).
Reconnect compressor
connector.
Refer to 12-5. “How to check
inverter/ compressor”.
Check stop valve.
-
Compressor synchronous
abnormality (Compressor
start-up failure protection)
12-time flash
2.5 seconds OFF
Waveform of compressor
current is
distorted.
Reconnect compressor
connector.
Refer to 12-5. “How to check
inverter/compressor”.
-
5-time flash
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 12-5. “Check of LEV”.
-
6-time flash
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.
-
FAILURE MODE RECALL M SERIES
- OUTDOOR UNIT - MONOSPLIT
MITSUBISHI ELECTRIC
/ DIAGNOSTIC
Summary of Contents for M-SERIES
Page 1: ...Practical installation guide DX ...
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Page 39: ...37 MITSUBISHI ELECTRIC COMMERCIAL ...
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Page 61: ...59 MITSUBISHI ELECTRIC REPLACE TECHNOLOGY ...
Page 75: ...73 MITSUBISHI ELECTRIC REPLACE TECHNOLOGY COMMERCIALE ...
Page 76: ...74 Ventilation ...
Page 77: ...75 MITSUBISHI ELECTRIC VENTILATION ...
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