Mitsubishi Electric MXZ-2C20NA2-U1, Руководство по обслуживанию

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The left lamp of
OPERATION IN-
DICATOR 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) Lit Lit
2-time blink Outdoor power system Lit Lit Overcurrent protection cut-out operates
3 consecutive times within 1 minute after
the compressor gets started, or converter
protection cut-out or bus-bar voltage
protection cut-out operates 3 consecutive
times within 3 minutes after startup. • Check the connection of the com-
pressor connecting wire.
• Refer to 11-6.
"How to check inverter/compres-
sor".
• Check the stop valve.
ż
3-time blink Discharge temperature thermistor Lit Once A thermistor shorts or opens during
compressor running. • Refer to 11-6. "Check of outdoor
thermistors".
ż
Defrost thermistor Lit Once
Ambient temperature thermistor Lit Twice
Fin temperature thermistor Lit 3 times
P.C. board temperature thermistor Lit 4 times • Replace the outdoor control P.C. board.
Outdoor heat exchanger tem-
perature thermistor Lit 9 times • Refer to 11-6. "Check of outdoor
thermistors".
4-time blink Overcurrent Once Not lit 18A ( MXZ-2C20NA2 )/21 A (
0;=&&&1$
0;=&&&1$
)/28 A (
0;=&1$
0;=&&&1$+= 0;=&1$ 0;=
&&&1$+=
FXUUHQWÀRZVLQWRSRZHUPRGXOH
• Reconnect compressor connector.
• Refer to 11-6. "How to check in-
verter/compressor".
• Check the stop valve.
—
5-time blink Discharge temperature Lit Lit The discharge temperature exceeds 239°F ( MXZ-
2C20NA2 )/222.8°F (
0;=&&&1$
0;=&&&1$
)/240.8°F ( MXZ-2C20
&&1$+=&1$0;=&&
&1$+=&1$
) during operation.
Compressor can restart if discharge temperature
thermistor reads 176°F (
MXZ-2C20NA2 ) 203°F
(
0;=&&&1$0;=&&
&1$
)/212°F (
0;=&&&1$+=
&1$0;=&&&1$+=&1$
)
or less 3 minutes later.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-6. "Check of LEV".
—
6-time blink High pressure Lit Lit The outdoor heat exchanger temperature ex-
ceeds 158°F during cooling or the indoor gas
pipe temperature exceeds 158°F during heating. • Check refrigerant circuit and refrig-
erant amount.
• Check the stop valve.
—
7-time blink Fin temperature 3 times Not lit
7KH¿QWHPSHUDWXUHH[FHHGVƒ) 0;=&&
&1$0;=&&&&1$
)/192°F
(
0;=&&&1$+=&1$0;=&
&&1$+=&1$
) 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 lit The P.C. board temperature exceeds 152°F ( MXZ-
&&&1$ 0;=&&&
4C36NA2 )/189°F (
0;=&&&1$+=
0;=&1$ 0;=&&&1$+=
5C42NA2 ) during operation.
8-time blink Outdoor fan motor Lit Lit A failure occurs 3 consecutive times within
30 seconds after the fan gets started. • Refer to 11-6. "Check of outdoor
fan motor".
—
9-time blink Outdoor control system Lit 5 times Nonvolatile memory data cannot be read
properly.
• Replace the outdoor control P.C.
board.
ż
10-time blink Low discharge temperature
protection Lit Lit The frequency of the compressor is kept 80
Hz or more and the discharge temperature is
kept under 102.2°F for more than 20 minutes. • Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-6. "Check of LEV".
—
11-time blink Communication error
between P.C. boards Lit 6 times Communication error occurs between the out-
door control P.C. board and outdoor power P.C.
board for more than 10 seconds.
• Check the connecting wire between
outdoor control P.C. board and out-
door power P.C. board.
—
The communication between boards protec-
tion cut-out operates 2 consecutive times.
ż
Current sensor Lit 7 times A short or open circuit is detected in the cur-
rent sensor during compressor operating.
—
—
Current sensor protection cut-out oper-
ates 2 consecutive times.
ż
Zero cross detecting circuit 5 times Not lit Zero cross signal cannot be detected
while the compressor is operating. • Check the connecting wire among
outdoor control P.C. board and out-
door power P.C. board.
—
The protection cut-out of the zero cross de-
tecting circuit operates 10 consecutive times.
ż
Converter 5 times Not lit A failure is detected in the operation of the
converter during operation. • Check the voltage of power supply.
• Replace the outdoor power P.C.
board.
—
Bus-bar voltage 5 times Not lit The bus-bar voltage exceeds 400 V or
falls to low level during compressor oper-
ating. • Check the voltage of power supply.
• Replace the outdoor power P.C. board
or the outdoor control P.C. board.
15-time blink LEV and drain pump Lit Lit The indoor unit detects an abnormality in
the LEV and drain pump. • Refer to 11-6. "Check of LEV".
• Check the drain pump of the indoor unit.
—
NOTE
: Blinking patterns of this mode differ from the ones of
TROUBLESHOOTING CHECK TABLE (11-4.).
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