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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
11-time fl ash
2.5 seconds
OFF
DC voltage 8-time fl ash
2.5 seconds OFF
DC voltage of inverter cannot be
detected normally.
Refer to 11-5.
"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.
12-time fl ash
2.5 seconds
OFF
Overcurrent Compressor
open-phase
10-time fl ash
2.5 seconds OFF
Large current fl ows into the intelligent
power module (IPM)/ IGBT module
(IC700)/ power module (IPM). 1.
The open-phase operation of
compressor is detected.
The interphase short circuit occurs
in the output of the intelligent power
module (IPM)/ IGBT module (IC700)/
power module (IPM). 1.
Reconnect
compressor connector.
Refer to 11-5. "How
to check inverter/
compressor".
•
•
—
○
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 the stop valve •
○○
4-way valve/
Pipe temperature
(VAD)
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.).
11-3. TROUBLESHOOTING CHECK TABLE
No. Symptom LED indication
Abnormal point/
Condition
Condition Remedy
1
Outdoor unit
does not op-
erate.
1-time fl ash every
2.5 seconds
Outdoor power sys-
tem
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
Check the stop valve.
•
•
•
2
Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature ther-
mistor, P.C. board temperature thermistor or ambient tempera-
ture thermistor shorts or opens during compressor running.
Refer to 11-5. "Check of outdoor
thermistors".
•
3
Outdoor control sys-
tem
Nonvolatile memory data cannot be read properly.
(The upper lamp of OPERATION INDICATOR lamp of the in-
door unit lights up or fl ashes 7-time.)
Replace the inverter P.C. board. •
4
6-time fl ash
2.5 seconds OFF
Serial signal The communication fails between the indoor and outdoor unit
for 3 minutes.
Refer to 11-5.
"How to check mis-
wiring and serial signal error.
•
5
11-time fl ash
2.5 seconds OFF
Stop valve/
Closed valve
Closed valve is detected by compressor current. Check the stop valve. •
6
14-time fl ash
2.5 seconds OFF
Outdoor unit
(Other abnormality)
Outdoor unit is defective. Refer to 11-2.2. "Flow chart of the
detailed outdoor unit failure mode
recall function".
•
7
16-time fl ash
2.5 seconds OFF
(VAD)
4-way valve/
Pipe temperature
The 4-way valve does not work properly.
The indoor coil thermistor detects an abnormal temperature.
Refer to 11-5.
"Check of R.V.
coil".
Replace the inverter P.C. board.
•
•
8
'Outdoor unit
stops and
restarts 3
minutes later'
is repeated.
2-time fl ash
2.5 seconds OFF
Overcurrent protec-
tion
Large current fl ows into the intelligent power module (IPM)/
IGBT module (IC700)/ power module (IPM). 1.
Reconnect the connector of the com-
pressor.
Refer to 11-5. "How to check in-
verter/compressor".
Check the stop valve.
•
•
•
9
3-time fl ash
2.5 seconds OFF
Discharge tempera-
ture overheat protec-
tion
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".
•
•
10
4-time fl ash
2.5 seconds OFF
Fin temperature
/P.C. board tem-
perature thermistor
overheat protection
Temperature of fi n temperature thermistor on the heat sink
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".
•
•
•
11
5-time fl ash
2.5 seconds OFF
High pressure pro-
tection
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.
•
•
12
8-time fl ash
2.5 seconds OFF
Compressor synchro-
nous abnormality
The waveform of compressor current is distorted.
Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
•
•
13
10-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.
•
•
14
12-time fl ash
2.5 seconds OFF
Each phase current
of compressor
Each phase current of compressor cannot be detected nor-
mally.
Refer to 11-5. "How to check in-
verter/compressor".
•
15
13-time fl ash
2.5 seconds OFF
DC voltage DC voltage of inverter cannot be detected normally. Refer to 11-5.
"How to check in-
verter/compressor".
•
1.
Intelligent power module (IPM): MUZ-GE25VA -
A1
, MUZ-GE35/50VA
IGBT module (IC700): MUZ-GE60/71/80VAD
Power module (IPM): Other models
OBH532E