MXZ-5C42NA3 Service Manual

112
3. Table of outdoor unit failure mode recall function
NOTE
: Blinking patterns of this mode di󰀨er from the ones of
TROUBLESHOOTING CHECK TABLE (12-4.).
The left 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) 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 pro-
tection cut-out operates 3 consecutive
times within 3 minutes after startup.
• Check the connection of the com-
pressor connecting wire.
• Refer to 12-6. "How to check
inverter/compressor".
• Check the stop valve.
○
3-time blink Discharge temperature thermistor Lit Once A thermistor shorts or opens during com-
pressor running.
• Refer to 12-6. "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
temperature thermistor
Lit 9 times
• Refer to 12-6. "Check of outdoor
thermistors".
4-time blink Overcurrent Once Not lit
18 A (MXZ-2C20NA2, MXZ-2C20NA3, MXZ-
2C20NA4)/21 A (MXZ-3C24/3C30/4C36NA,
MXZ-3C24/3C30/4C36NA2, MXZ-3C24/3C30/
4C36NA3, MXZ-3C24/3C30/4C36NA4)/28 A
(MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ,
MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ2,
MXZ-5C42NA3, MXZ-2C20/3C24/3C30NAHZ3,
MXZ-5C42NA4, MXZ-2C20/3C24/3C30NAHZ4)
current ows into power module.
• Reconnect compressor connector.
• Refer to 12-6. "How to check
inverter/compressor".
• Check the stop valve.
—
5-time blink Discharge temperature Lit Lit
The discharge temperature exceeds 239°F
(MXZ-2C20NA2, MXZ-2C20NA3, MXZ-
2C20NA4)/222.8°F (MXZ-3C24/3C30/4C36NA,
MXZ-3C24/3C30/4C36NA2, MXZ-3C24/3C30/
4C36NA3, MXZ-3C24/3C30/4C36NA4)/240.8°F
(MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA,
MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2,
MXZ-2C20/3C24/3C30NAHZ3, MXZ-5C42NA3,
MXZ-2C20/3C24/3C30NAHZ4, MXZ-5C42NA4)
during operation.
Compressor can restart if discharge temperature
thermistor reads 176°F (MXZ-2C20NA2, MXZ-
2C20NA3, MXZ-2C20NA4)/203°F (MXZ-3C24/
3C30/4C36NA, MXZ-3C24/3C30/4C36NA2,
MXZ-3C24/3C30/4C36NA3, MXZ-3C24/3C30/
4C36NA4)/212°F (MXZ-2C20/3C24/3C30NAHZ,
MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2,
MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ3,
MXZ-5C42NA3, MXZ-2C20/3C24/3C30NAHZ4,
MXZ-5C42NA4) or less 3 minutes later.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 12-6. "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 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
The n temperature exceeds 190°F (MXZ-
3C24/3C30/4C36NA, MXZ-2C20/3C24/3C30/
4C36NA2, MXZ-2C20/3C24/3C30/4C36NA3,
MXZ-2C20/3C24/3C30/4C36NA4)/
192°F (MXZ-2C20/3C24/3C30NAHZ,
MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2,
MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ3,
MXZ-5C42NA3, MXZ-2C20/3C24/3C30NAHZ4,
MXZ-5C42NA4) during operation.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 12-6. "Check of outdoor
fan motor".
—
P.C. board temperature 4 times Not lit
The P.C. board temperature exceeds 152°F
(MXZ-3C24/3C30/4C36NA, MXZ-2C20/3C24/
3C30/4C36NA2, MXZ-2C20/3C24/3C30/
4C36NA3, MXZ-2C20/3C24/3C30/4C36NA4)/
189°F (MXZ-2C20/3C24/3C30NAHZ,
MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2,
MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ3,
MXZ-5C42NA3, MXZ-2C20/3C24/3C30NAHZ4,
MXZ-5C42NA4) during operation.
OBH702M