11-2. FAILURE MODE RECALL FUNCTION
2. Flow chart of the detailed outdoor unit failure mode recall function
2.Blinking pattern when outdoor unit is abnormal:
ON
OFF No beep Beeps
Repeated cycle
2.5-second OFF 3-second ON Blinking at 0.5- second interval
No beep Beeps
Repeated cycle
2.5-second OFF 3-second ON Blinking at 0.5- second interval
Repeated cycle Does the OPERATION INDICATOR lamp on the
indoor unit blink at the interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal. Beep is emit- ted at the same timing as the blinking of the OPERATION INDICATOR lamp. 2
Yes (Blinks)
No (OFF) The outdoor unit might be abnormal.
Conf rm if outdoor unit is abnormal according to the following procedures.
Operational procedure
Conf rm that the remote controller is in the failure mode recall function.
3
With the remote controller headed towards the indoor unit, press the TEMPERATURE buttons to adjust the set temperature to 25°C. 1
1 Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.
The outdoor unit is abnormal.
Check the blinking pattern, and conf rm the abnormal point with the out- door unit failure mode table (11-2.3.).
Make sure to check at least two consecutive blinking cycles. 2
Repair the defective parts.
The outdoor unit is normal.
Release the failure mode recall function. 3
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
Delete the memorized abnormal condition. 3
Release the failure mode recall function. 3
3 Refer to the service manual of indoor unit.
Release the failure mode recall function. 3
82
Abnormal point
(Failure mode / protection) Condition Remedy Indoor/outdoor
unit failure mode recall function LED indication
(Outdoor P.C. board) LED 1 LED 2 Upper or left lamp of
OPERATION INDICATOR lamp (Indoor unit) OFF 2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
8-time flash
Lighted Lighted Lighted Lighted
Lighted Once Lighted Once Lighted Twice Lighted 3 times Lighted 4 times
Lighted 9 times Once
Lighted Lighted
Lighted Lighted
3 times Not lighted 4 times Not
lighted
Lighted Lighted Lighted Lighted
Lighted 5 times 9-time flash
10-time flash
• Check the connection of the compressor connecting wire.
• Refer to 11-6.
"How to check inverter/compressor".
• Check the stop valve.
• Replace the inverter P.C. board.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Refer to 11-6. "Check of outdoor fan motor".
• Replace the inverter P.C. board.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Reconnect compressor connector.
• Refer to 11-6. "How to check inverter/
compressor".
• Check the stop valve.
• Check refrigerant circuit and refrigerant amount.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-6. "Check of outdoor fan motor".
• Refer to 11-6. "Check of outdoor thermistors".
• Refer to 11-6. "Check of outdoor thermistors".
Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started.
Thermistor shorts or opens during compressor running.
14 A (MXZ-2C30VA)/18 A (MXZ-2C 40VA, MXZ-2C52VA) current flows into intelligent power module.
Discharge temperature exceeds 116°C during operation.
Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.
The outdoor heat exchanger temperature exceeds 70°C during cooling or the indoor gas pipe temperature exceeds 70°C during heating.
The fin temperature exceeds 90°C during operation.
The P.C. board temperature exceeds 78°C during operation.
Failure occurs 3 consecutive times within 30 seconds after the fan gets started.
Nonvolatile memory data cannot be read properly.
Outdoor power system
Discharge temperature thermistor
Defrost thermistor
Ambient temperature thermistor Fin temperature thermistor P.C. board temperature thermistor
Outdoor heat exchanger temperature thermistor Overcurrent
Discharge temperature
High pressure
Fin temperature
P.C. board temperature
Outdoor fan motor
Nonvolatile memory data Discharge temperature
None (Normal)
Compressor Twice
9 times lightedNot
lightedNot
The possibility of intercepting the overcurrent by the compressor lock is high.
The compressor doesn't synchronize with the operating power.
• Check the connection of the compressor connecting wire.
• Refer to 11-6. "How to check inverter/
compressor".
The frequency of the compressor is kept 68 Hz (MXZ-2C30VA, MXZ- 2C40VA)/80Hz(MXZ-2C52VA) or more and the discharge temperature is kept under
50°C (COOL mode)/40°C (HEAT mode) for more than 40 minutes.
lightedNot
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
MXZ-2C
83
11-time flash
15-time flash
• Replace the inverter P.C.
board.
• Replace the inverter P.C.
board.
A short or open circuit is detected in the current sensor during compressor operating.
The bus-bar voltage exceeds 430 V or falls to 50 V or below during compressor operating.
Current sensor
Bus-bar voltage
LEV and drain pump
8 times Not lighted 6 times Not
lighted
The indoor unit detects abnormality in the LEV and drain pump.
Lighted Lighted 14-time flash
• Refer to 11-6. "Check of LEV".
• Check the drain pump of the indoor unit.
• Refer to 11-6. "How to check inverter/
compressor".
Power module There is a high possibility that the
power module is out of order.
7 times Not lighted
12 times Stop valve
(Closed valve) Closed valve is detected by compressor
current.(MXZ-2C30VA, MXZ-2C40VA) • Check the stop valve.
Lighted Abnormal point
(Failure mode / protection) Condition Remedy Indoor/outdoor
unit failure mode recall function LED indication
(Outdoor P.C. board) LED 1 LED 2 Upper or left lamp of
OPERATION INDICATOR lamp (Indoor unit)
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
84
The frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under
50°C (cooling)/40°C (heating) for more than 40 minutes.
Abnormal point
(Failure mode/protection) Condition Remedy Indoor/outdoor
unit failure mode recall function LED indication
(Outdoor P.C. board) LED 1 LED 2 OFF
2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
8-time flash
Lighted Lighted Lighted Lighted
Lighted Once Lighted Once Lighted Twice Lighted 3 times Lighted 4 times
Lighted 9 times
Once Not
lighted
Lighted Lighted
Lighted Lighted
3 times Not lighted 4 times Not
lighted
Lighted Lighted Lighted Lighted
Lighted 5 times 9-time flash
10-time flash
• Replace the electronic control P.C. board.
• Replace the electronic control P.C. board.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Reconnect compressor connector.
• Refer to 11-6. "How to check inverter/
compressor".
• Check the stop valve.
• Check refrigerant circuit and refrigerant amount.
• Check the stop valve.
• Refer to 11-6. "Check of outdoor fan motor".
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-6. "Check of outdoor fan motor".
• Check the connection of the compressor connecting wire.
• Refer to 11-6.
"How to check inverter/compressor".
• Check the stop valve.
• Refer to 11-6. "Check of outdoor thermistors".
• Refer to 11-6. "Check of outdoor thermistors".
Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started, or converter protection or bus-bar voltage protection cut-out operates 3 consecutive times within 3 minutes after start-up.
Thermistor shorts or opens during compressor running.
28 A current flows into intelligent power module.
Discharge temperature exceeds 116°C during operation.
Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.
High-pressure is detected with the high-pressure switch (HPS) during operation. (MXZ-3C68/4C71/
4C80/5C100VA, 4C80/5C100VA2) The outdoor heat exchanger temperature exceeds 70°C during cooling or the indoor gas pipe temperature exceeds 70°C during heating.
The fin temperature exceeds 89°C during operation.
The P.C. board temperature exceeds 73°C (MXZ-3C54/3C68/4C71VA)/
87°C (MXZ-4C80/5C100VA, 4C80/5C100VA2) during operation.
Failure occurs 3 consecutive times within 30 seconds after the fan gets started.
Nonvolatile memory data cannot be read properly.
Outdoor power system
Discharge temperature thermistor
Defrost thermistor
Ambient temperature thermistor Fin temperature thermistor P.C. board temperature thermistor
Overcurrent
Discharge temperature
High pressure
Fin temperature
P.C. board temperature
Outdoor fan motor
Nonvolatile memory data Discharge temperature
None (Normal) Upper or left lamp of
OPERATION INDICATOR lamp (Indoor unit)
Outdoor heat exchanger temperature thermistor
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
85
11-time flash
15-time flash
• Check the connecting wire between electronic control P.C. board and power board.
• Replace the power board.
• Check the connecting wire between electronic control P.C. board, noise filter P.C. board and power board.
• Check the voltage of power supply.
• Replace the power board.
• Check the voltage of power supply.
• Replace the electronic control P.C. board.
• Refer to 11-6. "Check of LEV".
• Check the drain pump of the indoor unit.
The communication between boards protection cut-out operates 2 consecutive times.
Communication error occurs between the electronic control P.C.
board and power board for more than 10 seconds.
Current sensor protection cut-out operates 2 consecutive times.
A short or open circuit is detected in the current sensor during compressor operating.
The protection cut-out of the zero cross detecting circuit operates 10 consecutive times.
Zero cross signal cannot be detected while the compressor is operating.
A failure is detected in the operation of the converter during operation.
The bus-bar voltage exceeds 400 V or falls to 200 V or below during compressor operating.
The bus-bar voltage exceeds 400 V (MXZ-3C54/3C68/4C71VA) 430 V (MXZ-4C80/5C100VA, 4C80/5C100VA2) or falls to 50V or below during compressor operating.
Communication error between P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage (1)
Bus-bar voltage
(2) Even if this protection stop is performed continuously three times, it does not mean the abnormality in outdoor power system.
LEV and drain pump
Lighted 6 times
Lighted 7 times
5 times Not lighted
5 times Not lighted 5 times
6 times lightedNot
lightedNot
The indoor unit detects an abnormality in the LEV and drain pump.
Lighted Lighted Abnormal point
(Failure mode/protection) Condition Remedy Indoor/outdoor
unit failure mode recall function LED indication
(Outdoor P.C. board) LED 1 LED 2 Upper or left lamp of
OPERATION INDICATOR lamp (Indoor unit)
NOTE: Blinking patterns of this mode differ from the ones of "Troubleshooting check table" (11-4).
86
Upper or 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) Lighted Lighted
2-time f ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates 3 consecutive times, bus-bar voltage protection cut-out operates 3 consecu- tive times, or primary current protection cut-out operates 3 consecutive times within 1minute after the compressor gets started.
• Check the connection of the compressor connecting wire.
• Refer to 11-6. How to check inverter/compressor.
• Check the stop valve.
○
3-time f ash Discharge temperature thermis-
tor Lighted Once Thermistor shorts or opens during
compressor 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 power board
(MXZ-6C120VA)/outdoor pow- er P.C. board (MXZ-6C122VA).
P.C. board temperature thermis-
tor Lighted 4 times • Replace the power board
(MXZ-6C120VA)/outdoor pow- er P.C. board (MXZ-6C122VA).
Outdoor heat exchanger tem-
perature thermistor Lighted 9 times • Refer to 11-6. "Check of
outdoor thermistors".
4-time f ash Overcurrent Once Not
lighted 40 A current f ows into intelligent power
module. • Reconnect compressor con-
nector.
• Refer to 11-6. "How to check inverter/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 f ash Discharge temperature Lighted Lighted Discharge temperature exceeds 114 °C during operation.
Compressor can restart if discharge temperature thermistor reads 100 °C or less 3 minutes later.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of
LEV". —
6-time f ash High pressure Lighted Lighted High-pressure is detected with the high-pressure switch (HPS) during op- eration.
• Check refrigerant circuit and refrigerant amount.
• Check the stop valve.
The outdoor heat exchanger tempera- — ture exceeds 70 °C during cooling or the indoor gas pipe temperature ex- ceeds 70°C during heating.
7-time f ash Fin temperature 3 times Not
lighted The fin temperature exceeds:110 °C (MXZ-6C120VC-E1) / 105°C (MXZ- 6C120VC-E2, MXZ-6C122VC-E1 ) dur- ing operation.
• Check around outdoor unit.
• Check outdoor unit air pas- sage.
• Refer to 11-6. "Check of outdoor fan motor".
—
P.C. board temperature 4 times Not
lighted The P.C. board temperature exceeds 95 °C during operation.
8-time f 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 20 °C or more.
• Refer to 11-6. "Check of outdoor fan motor".
—
9-time f ash Nonvolatile memory data Lighted 5 times Nonvolatile memory data cannot be
read properly. • Replace the control P.C. board
(MXZ-6C120VA)/outdoor control P.C. board (MXZ- 6C122VA).
• Replace the power board (MXZ-6C120VA)/outdoor pow- er P.C. board (MXZ-6C122VA).
○
10-time f ash Discharge temperature Lighted Lighted The frequency of the compressor is kept 58Hz or more and the discharge temperature is kept under 50 °C (cool- ing)/40 °C (heating) for more than 40 minutes.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of
LEV". —
87 Operation start
Check the outdoor unit LED indicator.
Refer to 11-6.
"Check of power supply".
• When cooling, dew drops in the non-operating indoor unit.
Check of mispiping
• Indoor unit serial signal error
Refer to 11-6.
"How to check miswiring and serial signal error".
• COOL or HEAToperation only Refer to 11-6.
"Check of R.V. coil".
• When cooling, room does not cool.
Refer to 11-6.
"How to check of inverter/
compressor".
• When cooling, heat exchanger of non-operating indoor unit frosts.
•When heating, non- operating indoor unit gets warm.
Refer to 11-6.
"Check of LEV".
• When heating, room does not get warm.
Refer to 11-6.
"How to check of inverter/compressor".
Check mispiping, shortage of capacity
Refer to 11-4.
"Troubleshooting check table".
Both LED 1 and
LED 2 are lighting. LED 1 or LED 2
has blinked.
Both LED 1 and LED 2 are OFF.