Mitsubishi Electric MXZ-5B42NA, Руководство по обслуживанию, Страница: 59 / 154

59
MXZ-5B
The left lamp of
OPERATION IN-
DICATOR lamp
(Indoor unit)
Abnormal point
(Failure mode/protection)
LED indication
(Outdoor P.C.
board)
Condition Remedy
Indoor/out-
door unit
failure mode
recall function
LED 1 LED 2
OFF None (Normal) Lighted Lighted
2-time fl ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates 3
consecutive times, bus-bar voltage protec-
tion cut-out operates 3 consecutive times,
or primary current protection cut-out oper-
ates 3 consecutive times within 1minute
after the compressor gets started.
• Check the connection of the com-
pressor connecting wire.
• Refer to 11-6. How to check in-
verter/compressor.
• Check the stop valve.
○
3-time fl ash Discharge temperature thermistor Lighted Once Thermistor shorts or opens during com-
pressor running. • Refer to 11-6. "Check of outdoor
thermistors".
○
Defrost thermistor Lighted Once
Ambient temperature thermistor Lighted Twice
Fin temperature thermistor Lighted 3 times • Replace the outdoor power P.C. board .
P.C. board temperature thermistor Lighted 4 times • Replace the outdoor power 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
40 A current flows into intelligent power
module. • Reconnect compressor connector.
• Refer to 11-6. "How to check in-
verter/compressor".
• Check the stop valve.
—
Out-of-step protection 9 times Not
lighted
Waveform of compressor current is dis-
torted. • Refer to 11-6. " How to check
inverter/compressor.
5-time fl ash Discharge temperature Lighted Lighted Discharge temperature exceeds 237.2°F
during operation.
Compressor can restart if discharge tem-
perature thermistor reads 212°F or less 3
minutes later.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-6. "Check of LEV". —
6-time fl ash High pressure Lighted Lighted High-pressure is detected with the high-
pressure switch (HPS) during operation.
• Check refrigerant circuit and refrig-
erant amount.
• Check the stop valve.
—
The outdoor heat exchanger temperature
exceeds 158°F during cooling or the
indoor gas pipe temperature exceeds
158°F during heating.
7-time fl ash Fin temperature 3 times Not
lighted
The fin temperature exceeds
:
230°F during
operation.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-6. "Check of outdoor
fan motor".
—
P.C. board temperature 4 times Not
lighted
The P.C. board temperature exceeds
203°F during operation.
8-time fl ash Outdoor fan motor Lighted Lighted The fan motor speed is 50 rpm or less
or 1500 rpm or more for 1 minute, or the
fan motor speed is 100 rpm or less for 15
seconds when the outside temperature is
68°F or more.
• 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 outdoor control P.C. board.
• Replace the outdoor power P.C. board.
○
10-time fl ash Discharge temperature Lighted Lighted The frequency of the compressor is kept
58Hz or more and the discharge tempera-
ture is kept under 122°F (cooling)/104°F
(heating) for more than 40 minutes.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-6. "Check of LEV".
—
NOTE
: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
OBH560G