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Flow chart of the detailed outdoor unit failure mode recall function

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 left lamp of OPERATION INDICATOR lamp

on the indoor unit blink at the interval of 0.5 seconds?

Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. 2

Yes (Blinks)

No (OFF) The outdoor unit might be abnormal.

Check if outdoor unit is abnormal according to the following procedures.

Operational procedure

Make sure that the remote controller is set to the failure mode recall function.

With the remote controller headed towards the indoor unit, press TEMP button 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 identify the abnormal point by referring to the outdoor unit failure mode table (11-2.3.).

Make sure to check at least 2 consecutive blinking cycles. 2

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

Repair the failure parts.

The outdoor unit is normal.

Release the failure mode recall function accord- ing to the left mentioned procedure.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" (11-2.1.).

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4 Release the failure mode recall function according to "Releasing the failure mode recall function" men-

tioned above.

NOTE: 1. Make sure to release the failure mode recall function after 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.

4 The information regarding whether the connected outdoor unit is a low-standby-

power model or a non-low-standby-power model will also be initialized.

(Default= compatible with a low-standby- power model)

NOTE: It takes up to 1 minute to indicate the outdoor unit abnormality.

Even if the OPERATION INDICATOR lamp is not lighting, keep checking at least 1 minute or longer.

34 3. Outdoor unit failure mode table

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

Outdoor unit failure mode recall function

OFF None (Normal)

1-time fl ash 2.5 seconds OFF

Indoor/outdoor communication, receiving

error

Any signals from the inverter P.C.

board cannot be received normally for 3 minutes.

•Refer to 11-5. How to check miswiring and serial signal error.

○ ○

Indoor/outdoor communication, receiving

error

Although the inverter P.C. board sends signal "0", signal "1" has been received 30 consecutive times.

•Refer to 11-5. How to check miswiring and serial signal error.

2-time fl ash 2.5 seconds OFF

Outdoor power system

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

• Reconnect connectors.

• Refer to 11-5. "How to check inverter/

compressor".

• Check the 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 11-5.

"Check of outdoor thermistors".

Defective outdoor thermistors can be identifi ed by checking the blinking pattern of

LED.

○ ○

Defrost thermistor

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 Outdoor heat exchanger

temperature thermistor

4-time fl ash 2.5 seconds OFF

Overcurrent 11-time fl ash

2.5 seconds OFF

Large current fl ows into power module. • Reconnect

compressor connector.

• Refer to 11-5. "How to check inverter/

compressor".

• Check the 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 11-5. "How to check inverter/

compressor".

5-time fl ash 2.5 seconds OFF

Discharge temperature

Temperature of discharge temperature thermistor exceeds 116°C, compressor stops.

Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 11-5. "Check of LEV".

6-time fl ash 2.5 seconds OFF

High pressure

Temperature indoor coil thermistor exceeds 70°C in HEAT mode.

Temperature defrost thermistor exceeds 70°C in COOL mode.

• Check the refrigerant circuit and the refrigerant amount.

• Check the 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 75 - 86°C, or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 72 - 85°C.

• Check around the outdoor unit.

• Check outdoor unit air passage.

• Refer to 11-5. "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 11-5. "Check of outdoor fan motor".

Refer to 11-5. "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.

○ ○

Power module 6-time fl ash

2.5 seconds OFF

The interface short circuit occurs in the output of the power module (IC700).

The compressor winding shorts circuit.

• Refer to 11-5. "How to check inverter/

compressor".

10-time fl ash 2.5 seconds OFF

Discharge temperature

Temperature of discharge temperature thermistor has been 50°C or less for 20 minutes.

• Refer to 11-5. "Check of LEV".

• Check the refrigerant circuit and the refrigerant amount.

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).

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

Outdoor unit failure mode recall function 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 11-5. "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.

14-time fl ash or more 2.5 seconds OFF

Stop valve (Closed valve) 14-time fl ash 2.5 seconds OFF

Closed valve is detected by compressor current.

• Check the stop valve.

○ ○

4-way valve/

Pipe temperature

16-time fl ash 2.5 seconds OFF

The 4-way valve does not work properly.

The indoor coil thermistor detects an abnormal temperature.

• Check 4-way valve.

• Replace inverter P.C.

board.

Outdoor refrigerant system abnormality

17-time fl ash 2.5 seconds OFF

A closed valve and air trapped in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor.

• Check for a gas leak in a connecting piping etc.

• Check the stop valve.

• Refer to 11-5.

“Check of outdoor refrigerant circuit”.

○ ○

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).

36

11-3. TROUBLESHOOTING CHECK TABLE

No. Symptom LED indication Abnormal point/

Condition Condition Remedy

1

Outdoor unit does not op- erate.

1-time fl ash every 2.5 seconds

Outdoor power sys- tem

Overcurrent protection cut-out operates 3 consecutive times

within 1 minute after the compressor gets started. • Reconnect connector of compres- sor.

• Refer to 11-5. "How to check in- verter/compressor".

• Check the stop valve.

2

Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, defrost thermistor, P.C. board temperature thermistor, outdoor heat exchanger temperature thermistor or ambient tempera- ture thermistor shorts or opens during compressor running.

• Refer to 11-5. "Check of outdoor thermistors".

3

Outdoor control sys- tem

Nonvolatile memory data cannot be read properly.

(The left lamp of OPERATION INDICATOR lamp of the indoor unit lights up or fl ashes 7-time.)

• Replace inverter P.C. board.

4 6-time fl ash

2.5 seconds OFF

Serial signal The communication fails between the indoor and outdoor unit for 3 minutes.

• Refer to 11-5. "How to check miswiring and serial signal error.

5 11-time fl ash

2.5 seconds OFF

Stop valve/

Closed valve

Closed valve is detected by compressor current. • Check the stop valve.

6

16-time fl ash 2.5 seconds OFF

4-way valve/

Pipe temperature

The 4-way valve does not work properly.

The indoor coil thermistor detects an abnormal temperature. • Refer to 11-5. "Check of R.V.

coil".

• Replace inverter P.C. board.

7

17-time fl ash 2.5 seconds OFF

Outdoor refrigerant system abnormality

A closed valve and air trapped in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor.

• Check for a gas leak in a connecting piping etc.

• Check the stop valve.

• Refer to 11-5. “Check of outdoor refrigerant circuit”.

8

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

2-time fl ash 2.5 seconds OFF

Overcurrent protec- tion

Large current fl ows into power module. • Reconnect connector of compressor.

• Refer to 11-5. "How to check in- verter/compressor".

• Check the stop valve.

9

3-time fl ash 2.5 seconds OFF

Discharge tempera- ture overheat pro- tection

Temperature of discharge temperature thermistor exceeds 116°C, compressor stops. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 11-5. "Check of LEV".

10

4-time fl ash 2.5 seconds OFF

Fin temperature / P.C. board tem- perature thermistor overheat protection

Temperature of fi n temperature thermistor on the heat sink exceeds 75 - 86°C or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 72 - 85°C.

• Check around the outdoor unit.

• Check the outdoor unit air passage.

• Refer to 11-5. "Check of outdoor fan motor".

11

5-time fl ash 2.5 seconds OFF

High pressure pro- tection

Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost

thermistor exceeds 70°C in COOL mode. • Check the refrigerant circuit and the refrigerant amount.

• Check the stop valve.

12

8-time fl ash 2.5 seconds OFF

Compressor syn- chronous abnormal- ity

The waveform of compressor current is distorted. • Reconnect connector of compressor.

• Refer to 11-5. "How to check in- verter/compressor".

13

10-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 11-5. "Check of outdoor fan motor.

• Refer to 11-5. "Check of inverter P.C. board.

14 12-time fl ash

2.5 seconds OFF

Each phase current of compressor

Each phase current of compressor cannot be detected nor- mally.

• Refer to 11-5. "How to check in- verter/compressor".

15 13-time fl ash

2.5 seconds OFF

DC voltage DC voltage of inverter cannot be detected normally. • Refer to 11-5. "How to check in- verter/compressor".

16 Outdoor unit operates.

1-time fl ash 2.5 seconds OFF

Frequency drop by current protection

When the input current exceeds approximately 7A(EF25)/8A(E F35)/9A(EF42)/12A(EF50), compressor frequency lowers.

The unit is normal, but check the following.

• Check if the indoor fi lters are clogged.

• Check if the refrigerant is short.

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

17

3-time fl ash 2.5 seconds OFF

Frequency drop by high pressure pro- tection

Temperature of indoor coil thermistor exceeds 55°C in HEAT mode, compressor frequency lowers.

Frequency drop by defrosting in COOL mode

Indoor coil thermistor reads 8°C or less in COOL mode, com- pressor frequency lowers.

18

4-time fl ash 2.5 seconds OFF

Frequency drop by discharge tempera- ture protection

Temperature of discharge temperature thermistor exceeds

111°C, compressor frequency lowers. • Check the refrigerant circuit and the refrigerant amount.

• Refer to 11-5. "Check of LEV".

• Refer to 11-5. "Check of outdoor thermistors".

19

5-time fl ash 2.5 seconds OFF

Outside temperature thermistor protec- tion

When the outside temperature thermistor shorts or opens,

protective operation without that thermistor is performed. • Refer to 11-5. Check of outdoor thermistors.

NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 11-6.1.

2. LED is lighted during normal operation.

The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the fl ashing frequency is “2”.

ON

OFF 2.5-second OFF 2.5-second OFF

0.5-second ON 0.5-second ON

LED Flashing → Inverter P.C. board

No. Symptom LED indication Abnormal point/

Condition Condition Remedy

20

Outdoor unit operates.

7-time fl ash 2.5 seconds OFF

Low discharge tem- perature protection

Temperature of discharge temperature thermistor has been

50°C or less for 20 minutes. • Refer to 11-5. "Check of LEV".

• Check the refrigerant circuit and the refrigerant amount.

21

8-time fl ash 2.5 seconds OFF

PAM protection PAM: Pulse Ampli- tude Modulation

The overcurrent fl ows into PFC (Power factor correction :IC820) or the bus-bar voltage reaches 394 V or more, PAM stops and restarts.

This is not malfunction. PAM pro- tection will be activated in the fol- lowing cases:

1 Instantaneous power voltage drop. (Short time power failure) 2 When the power supply voltage

is high.

22

9-time fl ash 2.5 seconds OFF

Inverter check mode The connector of compressor is disconnected, inverter check mode starts.

• Check if the connector of the com- pressor is correctly connected.

Refer to 11-5. "How to check inverter/compressor".

NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 11-6.1.

2. LED is lighted during normal operation.

The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the fl ashing frequency is “2”.

ON

OFF 2.5-second OFF 2.5-second OFF

0.5-second ON 0.5-second ON

LED Flashing → Inverter P.C. board

38

11-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH

Part name Check method and criterion Figure

Defrost thermistor (RT61) Fin temperature

thermistor (RT64) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68)

Measure the resistance with a tester.

Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.

board”, for the chart of thermistor.

Discharge temperature thermistor (RT62)

Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.

Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.

board”, for the chart of thermistor.

Compressor

Measure the resistance between terminals using a tester.

(Temperature: -10 - 40°C)

Normal (Ω)

MUZ-SF25 MUZ-SF35 MUZ-SF42 MUZ-SF50 U-V

U-W V-W

1.20 - 1.72 1.36 - 1.93 1.52 - 2.17 0.78 - 1.11

Outdoor fan motor

Measure the resistance between lead wires using a tester.

(Temperature: -10 - 40°C)

Color of lead wire Normal (Ω)

MUZ-SF25/35/42 MUZ-SF50 RED – BLK

BLK – WHT WHT – RED

29 - 42 12 - 17

R. V. coil (21S4)

Measure the resistance using a tester. (Temperature: -10 - 40°C) Normal (kΩ)

1.19 - 1.78

Expansion valve coil (LEV)

Measure the resistance using a tester. (Temperature: -10 - 40°C) Color of lead wire Normal (Ω)

RED – ORN

37 - 54 RED – WHT

RED – BLU RED – YLW

RED (+12V)

YLW BLU

WHT ORN

LEV

Defrost heater MUZ-SF•VEH

Measure the resistance using a tester.

(Temperature: -10 - 40°C) Normal (Ω)

349 - 428

W

V U

WHT RED BLK

W

V U

WHT RED BLK