15
10-2-3. Outdoor unit failure mode table
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
None (Normal)
—
—
—
—
—
Outdoor power system
—
Overcurrent protection stop is continuously
performed 3 times within 1 minute after the
compressor gets started.
Reconnect connectors.
Refer to 10-5. "How to
check inverter/compressor".
Check stop valve.
•
•
•
○
○
Discharge temperature
thermistor
1-time
fl
ash every
2.5 seconds
Thermistor shorts or opens during compressor
running.
Refer to 10-5. "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
Ambient temperature
thermistor
2-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 10-5. "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 10-5. "How to check
inverter/compressor".
•
•
—
○
Discharge temperature
—
Temperature of discharge temperature
thermistor exceeds 241°F (116°C), compressor
stops.
Compressor can restart if discharge temperature
thermistor reads 212°F (100°C) or less 3
minutes later.
Check refrigerant circuit and
refrigerant amount.
Refer to 10-5. "Check of
LEV".
•
•
—
○
High pressure
—
Temperature of indoor coil thermistor exceeds
158°F (70°C) in HEAT mode. Temperature of
outdoor heat exchanger temperature thermistor
exceeds 158°F (70°C) in COOL mode.
Check refrigerant circuit and
refrigerant amount.
Check stop valve.
•
•
—
○
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 167 ~ 176°F (75 ~
80°C), or temperature of P.C. board temperature
thermistor on the inverter P.C. board exceeds
158 ~ 167°F (70 ~ 75°C).
Check around outdoor unit.
Check outdoor unit air
passage.
Refer to 10-5. "Check of
outdoor fan motor".
•
•
•
—
○
Outdoor fan motor
—
Outdoor fan has stopped 3 times in a row within
30 seconds after outdoor fan start-up.
Refer to 10-5. "Check of
outdoor fan motor". Refer to
10-5. "Check of inverter P.C.
board".
•
—
○
Nonvolatile memory data
5-time
fl
ash
2.5 seconds OFF
Nonvolatile memory data cannot be read
properly.
Replace the inverter P.C.
board.
•
○
○
Discharge temperature
—
Temperature of discharge temperature
thermistor has been 122°F (50°C) or less for 20
minutes.
Refer to 10-5. "Check of
LEV".
Check refrigerant circuit and
refrigerant amount.
•
•
—
○
DC voltage
8-time
fl
ash
2.5 seconds OFF
DC voltage of inverter cannot be detected
normally.
Refer to 10-5. "How to check
inverter/compressor".
•
—
○
Each phase current of
compressor
9-time
fl
ash
2.5 seconds OFF
Each phase current of compressor cannot be
detected normally.
Overcurrent Compressor open-
phase
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 10-5. "How to
check inverter/compressor".
•
•
—
○
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 (10-3.).
