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13-3. INSTRUCTION OF TROUBLESHOOTING

In document 3. INDOOR/OUTDOOR CORRESPONDENCE TABLE ··· 10 (сторінка 124-127)

Operation start

Check the outdoor unit LED indicator.

Refer to 13-6.

"Check of power supply".

• When cooling, dew drops in the non-operating indoor unit.

Check of mispiping

• Indoor unit serial signal error

Refer to 13-6.

"How to check miswiring and serial signal error".

• COOL or HEAT operation only Refer to 13-6.

"Check of R.V. coil".

• When cooling, room does not cool.

Refer to 13-6.

"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 13-6.

"Check of LEV".

• When heating, room does not get warm.

Refer to 13-6.

"How to check of inverter/compressor".

Check mispiping, shortage of capacity

Refer to 13-4.

"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.

13-4. TROUBLESHOOTING CHECK TABLE

MXZ-2A

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 Lighting Discharge temperature protection

4 times Lighting Low discharge temperature protection

• Check refrigerant circuit and refrigerant amount.

• Refer to 13-6. "Check of LEV".

• Refer to 13-6. "Check of outdoor thermistors".

• Refer to 13-6. "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 Lighting Once Lighting

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 (COOL mode)/40°C (HEAT mode) for more than 40 minutes.

The input current exceeds 8 A (MXZ-2A30VA)/ 10 A (MXZ-2A40VA, MXZ-2A52VA).

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)

Lighting Twice Outdoor power system

Lighting 3 times Discharge temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor

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

Abnormal point / Condition Correspondence

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 outdoor electronic control P.C. board.

Indication

Overcurrent protection stop is continuously performed three 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 Lighting 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 Lighting

Overcurrent

3 times Goes out Discharge temperature protection Fin temperature protection P.C. board temperature protection High-pressure protection

• Replace the power board.

Bus-bar voltage protection Goes out Outdoor fan motor 8 times Goes out Current sensor

protection • Replace the power board.

Goes out Compressor

• Refer to 13-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 13-6. "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 13-6. "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

• Refer to 13-6. "Check of outdoor fan motor".

• Reconnect compressor connector.

• Refer to 13-6. "How to check inverter/compressor".

• Check the stop valve.

Twice Goes out

4 times Goes out

5 times Goes out

9 times Goes out

23 A (MXZ-2A30VA- , MXZ-2A40VA, MXZ-2A52VA)/ 14 A (MXZ-2A 30VA- )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 continuously three 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 doesn't 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.

Lighting Once LEV for drain

• Check the connection of the compressor connecting wire.

• Refer to 13-6. "How to check inverter/compressor".

• Check the stop valve.

• Refer to 13-6. "Check of outdoor thermistors".

• Refer to 13-6. "Check of outdoor thermistors".

• Refer to 13-6. "Check of outdoor thermistors".

• Refer to 13-6 "Check of LEV".

• Check the drain pump of the indoor unit.

The indoor unit detects any abnormality in the LEV for drain.

Lighting 11 times Stop valve Closed valve

Closed valve is detected by compressor current.

(MXZ-2A30VA, MXZ-2A40VA - ) • Check the stop valve.

13 times

10 times

E2 E1 E2

-

- 9 times Lighting Inverter check mode

Lighting Lighting Normal

The unit is operated with emergency operation switch.

- 5 times Lighting 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 Correspondence

Condition No. Symptom

Outdoor unit operates normally.

21

22

Outdoor unit operates.

Display P.C. board(Parts side)

Lighting

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

(Example) When 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 13-7.6.

2. LED is lighted during normal operation.

In document 3. INDOOR/OUTDOOR CORRESPONDENCE TABLE ··· 10 (сторінка 124-127)