Service manual

41
3. Outdoor unit failure mode table
MUZ-A09/12/15/17NA MUY-A15/17NA
The left lamp of
OPERATION INDICATOR
lamp (Indoor unit)
Abnormal point
(Failure mode / protection)
LED indication
(Outdoor P.C. board)
Condition Correspondence
Indoor/outdoor
unit failure
mode recall
function
Outdoor unit
failure mode
recall function
OFF None (Normal)
—— ———
2-time fl ash
2.5 seconds OFF
Outdoor power system
—
Overcurrent protection stop is
continuously performed 3 times within
1 minute after the compressor gets
started.
• Reconnect
connectors.
• Refer to 10-5. "How
to check inverter/
compressor".
• Check stop valve.
○○
3-time fl ash
2.5 seconds OFF
Discharge temperature
thermistor
1-time fl ash every
2.5 seconds
Thermistor shorts or opens during
compressor running.
• Refer to 10-5.
"Check of outdoor
thermistors".
Defective outdoor
thermistors can be
identifi ed by checking
the blinking pattern of
LED.
○○
Defrost thermistor (MSZ)
Fin temperature thermistor 3-time fl ash
2.5 seconds OFF
P.C. board temperature
thermistor
4-time fl ash
2.5 seconds OFF
Ambient temperature
thermistor
2-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
Overcurrent 11-time fl ash
2.5 seconds OFF
24 A (09/12) / 26.5 A (15/17) current
fl ows into intelligent power module.
• Reconnect
compressor
connector.
• Refer to 10-5. "How
to check inverter/
compressor".
• Check stop valve.
—
○
Compressor synchronous
abnormality (Compressor
start-up failure protection)
12-time fl ash
2.5 seconds OFF
Waveform of compressor current is
distorted.
• Reconnect
compressor
connector.
• Refer to 10-5. "How
to check inverter/
compressor".
—
○
5-time fl ash
2.5 seconds OFF
Discharge temperature
—
Temperature of discharge temperature
thermistor exceeds 241°F (116°C),
compressor stops.
Compressor can restart if discharge
temperature thermistor reads 212°F
(100°C) or less 3 minutes later.
• Check refrigerant
circuit and refrigerant
amount.
• Refer to 10-5.
"Check of LEV".
—
○
6-time fl ash
2.5 seconds OFF
High pressure
—
Indoor coil thermistor temperature
exceeds 158°F (70°C) in HEAT mode.
(MUZ)
Defrost thermistor exceeds 158°F (70°
C) in COOL mode.
• Check refrigerant
circuit and refrigerant
amount.
• Check stop valve.
—
○
7-time fl ash
2.5 seconds OFF
Fin temperature / P.C. board
temperature
7-time fl ash
2.5 seconds OFF
Temperature of fi n temperature
thermistor on the inverter P.C. board
exceeds 180°F (82°C) (09/12) /188°
F (86.5°C) (15/17), or temperature of
P.C. board temperature thermistor on
the inverter P.C. board exceeds 176°F
(80°C).
• Check around outdoor
unit.
• Check outdoor unit air
passage.
• Refer to 10-5.
"Check of outdoor fan
motor".
—
○
8-time fl ash
2.5 seconds OFF
Outdoor fan motor
—
Outdoor fan has stopped 3 times in a
row within 30 seconds after outdoor
fan start-up.
• Refer to 10-5.
"Check of outdoor fan
motor".
• Refer to 10-5.
"Check of inverter P.C.
board".
—
○
9-time fl ash
2.5 seconds OFF
Nonvolatile memory data 5-time fl ash
2.5 seconds OFF
Nonvolatile memory data cannot be
read properly.
• Replace the inverter
P.C. board.
○○
10-time fl ash
2.5 seconds OFF
Discharge temperature
—
Temperature of discharge temperature
thermistor has been 122°F (50°C) or
less for 20 minutes.
• Refer to 10-5.
"Check of LEV".
• Check refrigerant
circuit and refrigerant
amount.
—
○
11-time fl ash
2.5 seconds OFF
DC voltage 8-time fl ash
2.5 seconds OFF
DC voltage of inverter cannot be
detected normally.
• Refer to 10-5. "How
to check inverter/
compressor".
—
○
Each phase current of
compressor
9-time fl ash
2.5 seconds OFF
Each phase current of compressor
cannot be detected normally.
12-time fl ash
2.5 seconds OFF
Overcurrent
Compressor open-phase
10-time fl ash
2.5 seconds OFF
24 A (09/12) / 26.5 A (15/17) current
fl ows into intelligent power module
(IPM).
The open-phase operation of
compressor is detected.
The interphase short out occurs in the
output of the intelligent power module
(IPM).
The compressor winding shorts out.
• Reconnect
compressor
connector.
• Refer to 10-5. "How
to check inverter/
compressor"
—
○
14-time fl ash
2.5 seconds OFF
Outdoor unit
(Other abnormality)
—
The inverter P.C. board is defective. • Replace the inverter
P.C. board.
—
○
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).