75
3. Table of outdoor unit failure mode recall function
NOTE: Blinking patterns of this mode differ from the ones of
TROUBLESHOOTING CHECK TABLE (11-4.).
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 pro-
tection cut-out or bus-bar voltage protec-
tion 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/compressor".
• Check the stop valve.
○
3-time blink Discharge temperature thermistor
Lit Once
A thermistor shorts or opens during
compressor running.
• Refer to 11-6. "Check of outdoor
thermistors".
○
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 tempera-
ture thermistor
Lit 9 times • Refer to 11-6. "Check of outdoor
thermistors".
4-time blink Overcurrent Once Not lit
18 A (NTXMMX20A122AA)/21 A (NTXMMX24A/30A132AA,
NTXMMX36A142AA)/28 A (NTXMMX42A152AA,
NTXMPH20A122AA, NTXMPH24A/30A132AA) current
ows into power module.
• 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 (NTXMMX20A122AA)/222.8°F
(NTXMMX24A/30A132AA, NTXMMX36A142AA)/
240.8°F (NTXMMX42A152AA, NTXMPH20A122AA,
NTXMPH24A/30A132AA) during operation.
Compressor can restart if discharge temperature
thermistor reads 176°F (NTXMMX20A122AA)/203°F
(NTXMMX24A/30A132AA,
NTXMMX36A142AA)/212°F (NTXMMX42A152AA,
NTXMPH20A122AA, NTXMPH24A/30A132AA) 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 exceeds
158°F during cooling or the indoor gas pipe tem-
perature 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
The n temperature exceeds 190°F (NTXMMX20A122AA,
NTXMMX24A/30A132AA, NTXMMX36A142AA)/192°F
(NTXMMX42A152AA, NTXMPH20A122AA,
NTXMPH24A/30A132AA) 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 (NTX
MMX20A122AA, NTXMMX24A/30A132AA,
NTXMMX36A142AA)/189°F (NTXMMX42A152AA,
NTXMPH20A122AA, NTXMPH24A/30A132AA) dur
-
ing 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.
○
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 protection
cut-out operates 2 consecutive times.
○
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 operates
2 consecutive times.
○
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.
○
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 operating.
• 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.
—
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