25
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
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
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
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
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 IGBT module
(IC700).
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
fl
ash
2.5 seconds OFF
Compressor current is abnormal.
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 refrigerant
circuit and 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 refrigerant
circuit and refrigerant
amount.
Check 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 outdoor
unit.
Check 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
Memory data
5-time
fl
ash
2.5 seconds OFF
Memory data cannot be read.
Replace the inverter
P.C. board.
•
○
○
IGBT module (IC700)
6-time
fl
ash
2.5 seconds OFF
Output of IGBT module (IC700) is
short.
Wiring of compressor is short.
•
•
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 refrigerant
circuit and refrigerant
amount.
•
•
—
○
11-time
fl
ash
2.5 seconds
OFF
Bus-bar voltage (DC)
8-time
fl
ash
2.5 seconds OFF
Bus-bar voltage cannot be detected
normally.
Refer to 11-5. "How
to check inverter/
compressor".
•
—
○
Compressor current
9-time
fl
ash
2.5 seconds OFF
Compressor current cannot be
detected normally.
14-time
fl
ash
2.5 seconds
OFF
Stop valve (Closed valve)
14-time
fl
ash
2.5 seconds OFF
Closed valve is detected by
compressor current.
Check stop valve
•
○
○
4-way valve/
Pipe temperature
16-time
fl
ash
2.5 seconds OFF
The 4-way valve does not work
properly.
The indoor coil thermistor detects an
abnormal temperature.
Check 4-way valve.
Replace inverter P.C.
board.
•
•
NOTE:
Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).
OBH635
