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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 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 oper-
ates 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 the intelligent
power module (IPM)/ IGBT module
(IC700)/ power module (IPM). 1.
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 of indoor coil thermistor
exceeds 70°C in HEAT mode.
Temperature of outdoor heat
exchanger temperature 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 ~ 80°C, or temperature of
P.C. board temperature thermistor on
the inverter P.C. board exceeds 70 ~
75°C.
Check around the
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 interphase short circuit occurs
in the output of the intelligent power
module (IPM)/ IGBT module (IC700)/
power module (IPM).
1.
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 the refrigerant
circuit and the
refrigerant amount.
•
•
—
○
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).
1.
Intelligent power module (IPM): MUZ-GE25VA -
A1
, MUZ-GE35/50VA
IGBT module (IC700): MUZ-GE60/71/80VAD
Power module (IPM): Other models
OBH532E