Toshiba MXZ-2DM40VA, Service Manual

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3. Outdoor unit failure mode table
MXZ-2DM
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
LED 1 LED 2
OFF None (Normal) Not lighted Not lighted — — —
2-time fl ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates
3 consecutive times within 1 minute after
the compressor gets started.
Compressor protection cut-out operates
24 consecutive times within 10 seconds
after the compressor gets started. • Check the compressor con-
necting wire.
• Refer to 11-6. "Check of
inverter/compressor".
• Check the stop valve.
○
3-time fl ash Discharge temperature
thermistor Lighted Once Thermistor shorts or opens during
compressor running. • Refer to 11-6. "Check of
outdoor thermistors".
○
Defrost thermistor Lighted Once
○
Ambient temperature
thermistor Lighted Twice
○
Fin temperature thermistor Lighted 3 times
○
P.C. board temperature
thermistor Lighted 4 times • Replace the inverter P.C.
board.
○
Outdoor heat exchanger
temperature thermistor Lighted 9 times • Refer to 11-6. "Check of
outdoor thermistors".
○
4-time fl ash Overcurrent Once Not
lighted
The overcurrent fl ows into intelligent
power module.
• Check the compressor con-
necting wire.
• Refer to 11-6. "Check of
inverter/compressor".
• Check the stop valve.
—
Compressor Twice Not
lighted
The overcurrent fl ows into intelligent
power module within 10 seconds after
the compressor gets started.
( The compressor gets restarted in
15 seconds.)
• Check the compressor con-
necting wire.
• Refer to 11-6. "Check of
inverter/compressor".
—
9 times Not
lighted
Waveform of compressor current is dis-
torted.
—
5-time fl ash Discharge temperature Lighted Lighted Discharge temperature exceeds 116ºC
during operation. • Check the refrigerant circuit
and the refrigerant amount.
• Refer to 11-6. "Check of
LEV".
—
6-time fl ash High pressure Lighted Lighted The outdoor heat exchanger temperature
exceeds 70ºC during cooling or the in-
door gas pipe temperature exceeds
70ºC during heating. • Check the refrigerant circuit
and the refrigerant amount.
• Check the stop valve.
—
7-time fl ash Fin temperature 3 times Not
lighted
The fi n temperature exceeds 90ºC
during operation.
• Check the around outdoor
unit.
• Check the outdoor unit air
passage.
—
P.C. board temperature 4 times Not
lighted
The P.C. board temperature exceeds
80ºC during operation. • Refer to 11-6. "Check of
outdoor fan motor".
—
8-time fl ash Outdoor fan motor Lighted Lighted Failure occurs 3 consecutive times within
30 seconds after the fan gets started. • Refer to 11-6. "Check of
outdoor fan motor".
—
9-time fl ash Nonvolatile memory data Lighted 5 times Nonvolatile memory data cannot be read
properly. • Replace the inverter P.C.
board.
○
Power module 7 times Not
lighted
The output of the power module that
drove the compressor was shorted or
the winding of the compressor was
shorted. • Refer to 11-6. "Check of
inverter/compressor".
○
10-time fl ash Discharge temperature Lighted Lighted The discharge temperature is kept
under 50ºC (COOL mode)/40ºC (HEAT
mode) for more than 40 minutes. • Check the refrigerant circuit
and the refrigerant amount.
• Refer to 11-6. "Check of
LEV".
—
11-time fl ash Current sensor 8 times Not
lighted
The sensor circuit of current of
compressor shorts or opens during
compressor operate. • Replace the inverter P.C.
board.
○
Bus-bar voltage 6 times Not
lighted
The bus-bar voltage exceeds 430 V or
falls to 50 V or below during compressor
operating. • Check the power supply.
• Replace the inverter P.C.
board.
○
14-time fl ash Stop valve Lighted 12 times The current of compressor is power
module is out of order.
• Check the stop valve.
• Check the refrigerant circuit
and the refrigerant amount.
○
17 time fl ash Outdoor refrigerant system
abnormality Lighted 17 times A closed valve and air trapped in the
refrigerant circuit are detected based on
the temperature sensed by the indoor and
outdoor thermistors and the current of the
compressor.
• Check for a gas leak in a con-
necting piping etc.
• Check the stop valve.
• Refer to 11-6. "Check of
outdoor refrigerant circuit".
○
NOTE:
Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
OBH739A