Obh532E - Mitsubishi Electric MUZ-GE25VA-a1 Service Manual

3. Outdoor unit failure mode table
The upper
lamp of
OPERATION Abnormal point
INDICATOR (Failure mode / protection)
lamp
(Indoor unit)
11-time fl ash DC voltage
2.5 seconds
OFF
Each phase current of
compressor
12-time fl ash Overcurrent Compressor
2.5 seconds open-phase
OFF
14-time fl ash Stop valve (Closed valve)
2.5 seconds
OFF
4-way valve/
Pipe temperature
(VAD)
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
Outdoor unit 1-time fl ash every
does not op- 2.5 seconds
1
erate.
2
3
6-time fl ash
4
2.5 seconds OFF
11-time fl ash
5
2.5 seconds OFF
14-time fl ash
2.5 seconds OFF
6
16-time fl ash
2.5 seconds OFF
7
(VAD)
'Outdoor unit 2-time fl ash
stops and 2.5 seconds OFF
restarts 3
8
minutes later'
is repeated.
3-time fl ash
2.5 seconds OFF
9
4-time fl ash
2.5 seconds OFF
10
5-time fl ash
2.5 seconds OFF
11
8-time fl ash
12 2.5 seconds OFF
10-time fl ash
2.5 seconds OFF
13
12-time fl ash
14
2.5 seconds OFF
13-time fl ash
15
2.5 seconds OFF

OBH532E

1.
Intelligent power module (IPM): MUZ-GE25VA -
IGBT module (IC700): MUZ-GE60/71/80VAD
Power module (IPM): Other models
LED indication
(Outdoor P.C. board)
8-time fl ash DC voltage of inverter cannot be
2.5 seconds OFF detected normally.
9-time fl ash Each phase current of compressor
2.5 seconds OFF cannot be detected normally.
10-time fl ash Large current fl ows into the intelligent
2.5 seconds OFF
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.
14-time fl ash Closed valve is detected by
2.5 seconds OFF compressor current.
16-time fl ash The 4-way valve does not work
2.5 seconds OFF properly.
The indoor coil thermistor detects an
abnormal temperature.
Abnormal point/
Condition
Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times
tem within 1 minute after the compressor gets started.
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.
Outdoor control sys- Nonvolatile memory data cannot be read properly.
tem (The upper lamp of OPERATION INDICATOR lamp of the in-
door unit lights up or fl ashes 7-time.)
Serial signal The communication fails between the indoor and outdoor unit
for 3 minutes.
Stop valve/ Closed valve is detected by compressor current.
Closed valve
Outdoor unit Outdoor unit is defective.
(Other abnormality)
4-way valve/ The 4-way valve does not work properly.
Pipe temperature The indoor coil thermistor detects an abnormal temperature.
Overcurrent protec- Large current fl ows into the intelligent power module (IPM)/
tion IGBT module (IC700)/ power module (IPM). 1.
Discharge tempera- Temperature of discharge temperature thermistor exceeds
ture overheat protec- 116°C, compressor stops. Compressor can restart if discharge
tion temperature thermistor reads 100°C or less 3 minutes later.
Fin temperature Temperature of fi n temperature thermistor on the heat sink
/P.C. board tem- exceeds 75 ~ 80°C or temperature of P.C. board temperature
perature thermistor thermistor on the inverter P.C.board exceeds 70 ~ 75°C.
overheat protection
High pressure pro- Temperature of indoor coil thermistor exceeds 70°C in HEAT
tection mode. Temperature of outdoor heat exchanger temperature
thermistor exceeds 70°C in COOL mode.
Compressor synchro- The waveform of compressor current is distorted.
nous abnormality
Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up.
Each phase current
Each phase current of compressor cannot be detected nor-
of compressor mally.
DC voltage DC voltage of inverter cannot be detected normally.
Condition
• Refer to 11-5. "How
to check inverter/
compressor".
• Reconnect
compressor connector.
• Refer to 11-5.
to check inverter/
compressor".
• Check the stop valve
• Check 4-way valve.
• Replace inverter P.C.
board.
Condition
69
, MUZ-GE35/50VA
A1
Indoor/outdoor
unit failure
Remedy
mode recall
recall function
function
—
"How
—
○
Remedy
• Reconnect connector of compressor.
• Refer to 11-5. "How to check in-
verter/compressor".
• Check the stop valve.
• Refer to 11-5. "Check of outdoor
thermistors".
• Replace the inverter P.C. board.
• Refer to 11-5. "How to check mis-
wiring and serial signal error.
• Check the stop valve.
• Refer to 11-2.2. "Flow chart of the
detailed outdoor unit failure mode
recall function".
• Refer to 11-5. "Check of R.V.
coil".
• Replace the inverter P.C. board.
• Reconnect the connector of the com-
pressor.
• Refer to 11-5. "How to check in-
verter/compressor".
• Check the stop valve.
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 11-5. "Check of LEV".
• Check around the outdoor unit.
• Check the outdoor unit air passage.
• Refer to 11-5. "Check of outdoor
fan motor".
• Check the refrigerant circuit and
the refrigerant amount.
• Check the stop valve.
• Reconnect connector of compressor.
• Refer to 11-5. "How to check in-
verter/compressor".
• Refer to 11-5. "Check of outdoor
fan motor.
• Refer to 11-5. "Check of inverter
P.C. board.
• Refer to 11-5. "How to check in-
verter/compressor".
• Refer to 11-5. "How to check in-
verter/compressor".
Outdoor unit
failure mode
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