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11-3. INSTRUCTION OF TROUBLESHOOTING

In document SERVICE MANUAL (сторінка 72-76)

• Check the indoor unit by referring to the indoor unit service manual, and confirm whether there is any problem in the indoor unit.

Then, check the outdoor unit by referring to this page.

11-4. TROUBLESHOOTING CHECK TABLE MXZ-2D

No.

1

2

3

4

5

6

8

9

10

11

12 13 14

15 Symptom

'Outdoor unit stops and restarts 3 minutes later' is repeated.

Primary current protection Secondary current protection High-pressure protection Defrosting in cooling

3 times Lighted Discharge temperature protection

4 times Lighted Low discharge temperature protection

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6. "Check of LEV".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

These symptoms do not mean any abnormality of the product, but check the following points.

• Check if indoor filters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

Twice Lighted Once Lighted

The discharge temperature exceeds 100°C during operation.

The frequency of the compressor is kept 68 Hz (MXZ-2D33VA, MXZ-2D40 VA)/80 Hz (MXZ-2D53VA/H) or more and the discharge temperature is kept under 50°C (COOL mode)/40°C (HEAT mode) for more than 40 minutes.

The input current exceeds 8 A (MXZ-2D33VA)/ 10 A (MXZ-2D40VA, MXZ-2D53VA/H).

The current of the compressor exceeds 17 A.

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

Outdoor unit operates.

16

17

18

19 7

LED1(Red) LED2(Yellow)

Lighted Twice Outdoor power system

Lighted 3 times Discharge temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Lighted 7 times Nonvolatile memory data • Replace the inverter P.C. board.

Abnormal point / Condition Remedy

A short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 5 minutes (in cooling) and 10 minutes (in heating) of compressor start-up.

A short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 5 minutes of compressor start-up.

• Replace the inverter P.C. board.

Indication

Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started.

A short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 10 minutes of compressor start-up.

Condition

The nonvolatile memory data cannot be read properly.

Fin temperature thermistor P.C board temperature thermistor Lighted 4 times

Ambient temperature thermistor

A short or open circuit is detected in the thermistor during operation.

A short or open circuit is detected in the thermistor during operation.

5 times Lighted

Overcurrent

3 times Not lighted Discharge temperature protection Fin temperature protection P.C. board temperature protection High-pressure protection

• Replace the inverter P.C. board.

Bus-bar voltage protection Not lighted Outdoor fan motor 8 times Not lighted Current sensor

protection • Replace the inverter P.C. board.

Not lighted Compressor

• Refer to 11-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

• Check the amount of gas and the refrigerant circuit.

• Check the stop valve.

• Check the amount of gas and refrigerant circuit.

• Refer to 11-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

Twice Not lighted

4 times Not lighted

5 times Not lighted

9 times Not lighted

14 A (MXZ-2D33VA)/18 A (MXZ-2D40VA, MXZ-2D53VA/H) current flows into intelligent power module.

The bus-bar voltage exceeds 430 V or falls to 50 V or below during compressor operating.

Discharge temperature exceeds 116°C during operation. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

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.

A short or open circuit is detected in the current sensor during compressor operating.

The compressor does not synchronize with the operating power.

The outdoor heat exchanger temperature exceeds 70°C during cooling or indoor gas pipe temperature exceeds 70°C during heating.

Outdoor unit does not

operate. Lighted Once LEV and drain pump

• 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".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check the drain pump of the indoor unit.

The indoor unit detects an abnormality in the LEV and drain pump.

Lighted 11 times Stop valve

Closed valve Closed valve is detected by compressor current.

(MXZ-2D33VA, MXZ-2D40VA) • Check the stop valve.

13 times

10 times

74

-

- 9 times Lighted Inverter check mode

Lighted Lighted Normal

The connector of compressor is disconnected.

Inverter check mode starts.

- 5 times Lighted Cooling high-pressure

protection

This symptom does not mean any abnormality of the product, but check the following points.

• Check if indoor filters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

The outdoor heat exchanger temperature exceeds 58°C during operation.

20

LED1(Red) LED2(Yellow)Indication Abnormal point / Condition Condition Remedy

No. Symptom

Outdoor unit operates normally.

22

23

Outdoor unit operates.

Outdoor display P.C. board (Parts side)

Lighted

8 times Lighted Converter protection A failure is detected in the operation of the converter during operation.

21 • Check the voltage of power supply.

• Replace the inverter P.C. board.

LED1 LED2 The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) The flashing frequency is “2”.

ON

OFF 2.5-second OFF 2.5-second OFF

0.5-second ON 0.5-second ON

NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.6.

2. LED is lighted during normal operation.

MXZ-3D/4D/5D

LED1(Red) LED2(Yellow)

Lighted Twice Outdoor power system

Lighted 3 times Discharge temperature thermistor

• Refer to 11-6. "Check of outdoor thermistors".

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Lighted 7 times Nonvolatile memory data • Replace the outdoor control P.C. board.

Lighted 8 times Current sensor • Replace the power P.C. board.

Lighted 11 times Communication error

between P.C. boards • Check the connecting wire between the outdoor control

P.C. board and the power P.C. board.

Lighted 12 times Zero cross detecting

circuit • Check the connecting wire between the outdoor control P.C.

board, the noise filter P.C. board and the power P.C. board.

Abnormal point / Condition Remedy

A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor 5 minutes (in cooling) and 10 minutes (in heating) after compressor start-up.

A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor 5 minutes after compressor start-up.

• Replace the outdoor control P.C. board.

Indication

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.

A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor 10 minutes after compressor start-up.

Condition

The nonvolatile memory data cannot be read properly.

Fin temperature thermistor P.C board temperature thermistor Lighted 4 times

Ambient temperature thermistor

Current sensor protection cut-out operates 2 consecutive times.

Communication error occurs twice between the outdoor control P.C. board and the power P.C. board for more than 10 seconds.

The protection cut-out of the zero cross detecting circuit operates 10 consecutive times.

A short or open circuit is detected in the thermistor during operation.

A short or open circuit is detected in the thermistor during operation.

5 times Lighted

IPM protection Lock protection

3 times Not lighted Discharge temperature protection Fin temperature protection P.C. board temperature protection High-pressure protection

8 times Not lighted Converter protection • Replace the power P.C. board.

Bus-bar voltage

protection (1) • Check the voltage of power supply.

• Replace the power P.C. board or the outdoor control P.C. board.

• Refer to 11-6. "Check of bus-bar voltage".

Bus-bar voltage protection (2)

13 times Not lighted Outdoor fan motor • Refer to 11-6. "Check of outdoor fan motor".

Lighted 8 times Current sensor

protection • Replace the power P.C. board.

Lighted 11 times Communication protection

between P.C. boards • Check the connecting wire between the outdoor

control P.C. board and the power P.C. board.

Lighted 12 times Zero cross detecting circuit

protection • Check the connecting wire between the outdoor control P.C.

board, the noise filter P.C. board and the power P.C. board.

• Check the amount of gas and the refrigerant circuit.

• Check the stop valve.

• Check the amount of gas and refrigerant circuit.

• Refer to 11-6. "Check of LEV".

•Check refrigerant circuit and refrigerant amount.

•Refer to 11-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 11-6. "How to check inverter/compressor".

• Check the stop valve.

• Check the power module (PAM module).

Twice Not lighted

4 times Not lighted

5 times Not lighted

6 times Not lighted

9 times Not lighted

Overcurrent is detected 30 seconds after compressor start-up.

Overcurrent is detected within 30 seconds after compressor start-up.

The bus-bar voltage falls to 200 V or below during compressor operating.

The bus-bar voltage exceeds 400 V (MXZ-3D54/3D68/4D72VA)/

430 V (MXZ-4D83/5D102VA) or falls to 50 V or below while the compressor is operating.

Discharge temperature exceeds 116°C during operation. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

The fin temperature exceeds 89°C during operation.

The P.C. board temperature exceeds 73°C (MXZ-3D54/3D68/4D72VA)/

87°C(MXZ-4D83/5D102VA) during operation.

High-pressure is detected with the high-pressure switch (HPS) during operation.(MXZ-3D68/4D72/4D83/5D102VA)

Pre-heat protection A failure is detected in the operation of pre-heat. • Replace the power P.C. board.

(MXZ-3D54/3D68/4D72VA)

Failure occurs 3 consecutive times within 30 seconds after the fan gets started.

A short or open circuit is detected in the current sensor while the compressor is operating.

Communication error occurs between the outdoor control P.C.

board and the power P.C. board for more than 10 seconds.

Zero cross signal cannot be detected while the compressor is operating.

The outdoor heat exchanger temperature exceeds 70°C during cooling or indoor gas pipe temperature exceeds 70°C during heating.

A failure is detected in the operation of the converter during operation.

Outdoor unit does not

operate. Lighted Once LEV and drain pump

• 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".

• Refer to 11-6. "Check of LEV".

• Check the drain pump of the indoor unit.

The indoor unit detects an abnormality in the LEV and drain pump.

No.

1

2

3

4

5

6 7

9 8

10

11

12

13

14

15

16 17 18 19

Symptom

'Outdoor unit stops and restarts 3 minutes later' is repeated.

76

Primary current protection Secondary current protection High-pressure protection Defrosting in cooling

3 times Lighted Discharge temperature protection

4 times Lighted Low discharge temperature protection

• Check refrigerant circuit and refrigerant amount.

• Refer to 11-6. "Check of LEV".

• Refer to 11-6. "Check of outdoor thermistors".

• Refer to 11-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

5 times Lighted Cooling high-pressure protection

This symptom does not mean any abnormality of the product, but check the following points.

• Check indoor filters are not clogged.

• Check there is sufficient refrigerant.

• Check indoor/outdoor unit air circulation is not short cycling.

-

-

These symptoms do not mean any abnormality of the product, but check the following points.

• Check indoor filters are not clogged.

• Check there is sufficient refrigerant.

• Check indoor/outdoor unit air circulation is not short cycling.

Twice Lighted Once Lighted

The outdoor heat exchanger temperature exceeds 58°C during operation.

9 times Lighted Inverter check mode

Lighted Lighted Normal

The unit is operated with emergency operation switch.

-

The primary current exceeds 15 A (MXZ-3D54/3D68/4D72VA)/

17 A (MXZ-4D83VA)/18 A (MXZ-5D102VA).

The current of the compressor exceeds 12 A (MXZ-3D54VA) /12.5A (MXZ-3D68/4D72VA) /10 A (MXZ-4D83/5D102VA).

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

The discharge temperature exceeds 100°C during operation.

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 50°C (cooling) /40°C (heating) for more than 40 minutes.

LED1(Red) LED2(Yellow)Indication Abnormal point / Condition Condition Remedy

No.

20

21

22

23

24

25

26

Outdoor unit operates normally.

Outdoor unit operates.

Symptom

Outdoor control P.C. board(Parts side)

LED2 LED1

Lighted

LED1 LED2

Lighted

In document SERVICE MANUAL (сторінка 72-76)

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