3. Outdoor unit failure mode table

POWER lamp

Abnormal point

LED indication

(Indoor unit)

(Failure mode / protection)

(Outdoor P.C. board)

 

 

 

Condition

Correspondence

Indoor/outdoor

unit failure

mode recall

function

Outdoor unit failure mode recall function

OFF

None (Normal)

 

 

 

 

 

 

 

 

 

 

 

2-time flash

Outdoor power system

 

Overcurrent protection stop is

•Reconnect connectors.

 

 

2.5 seconds

 

 

continuously performed 3 times within

•Refer to 10-5.

"How

OFF

 

1 minute after the compressor gets

to check inverter/

 

 

started.

compressor".

 

 

 

 

 

•Check stop valve.

 

 

 

 

 

 

 

 

 

 

3-time flash

Discharge temperature

1-time flash every

Thermistor shorts or opens during

•Refer to 10-5.

 

 

 

2.5 seconds

thermistor

2.5 seconds

compressor running.

"Check of outdoor

 

 

OFF

Defrost thermistor

 

 

thermistors".

 

 

 

 

 

 

Defective outdoor

 

 

 

 

 

 

 

 

 

 

 

 

thermistors can be

 

 

 

Fin temperature thermistor

3-time flash

 

 

 

identified by checking

 

 

2.5 seconds OFF

 

 

 

 

the blinking pattern of

 

 

 

 

 

P.C. board temperature

4-time flash

 

LED.

 

 

 

 

thermistor

2.5 seconds OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ambient temperature

2-time flash

 

 

 

 

 

 

thermistor

2.5 seconds OFF

 

 

 

 

 

 

 

 

 

 

 

 

4-time flash

Overcurrent

11-time flash

Large current flows into intelligent

•Reconnect compressor

 

 

2.5 seconds

 

2.5 seconds OFF

power module.

connector.

"How

 

OFF

 

 

 

•Refer to 10-5.

 

 

 

 

to check inverter/

 

 

 

 

compressor".

 

 

 

 

 

 

 

•Check stop valve.

 

 

 

Compressor synchronous

12-time flash

Waveform of compressor current is

•Reconnect compressor

 

 

 

abnormality (Compressor

2.5 seconds OFF

distorted.

connector.

"How

 

 

start-up failure protection)

 

 

•Refer to 10-5.

 

 

 

 

to check inverter/

 

 

 

 

compressor".

 

 

 

 

 

 

 

 

 

 

5-time flash

Discharge temperature

 

Temperature of discharge temperature

•Check refrigerant

 

 

2.5 seconds

 

 

thermistor exceeds 241 °F (116 °C),

circuit and refrigerant

 

 

OFF

 

 

compressor stops.

amount.

"Check

 

 

 

Compressor can restart if discharge

•Refer to 10-5.

 

 

temperature thermistor reads 212 °F

of LEV".

 

 

 

 

(100 °C) or less 3 minutes later.

 

 

 

 

 

 

 

 

 

 

 

6-time flash

High pressure

 

Temperature of indoor coil thermistor

•Check refrigerant

 

 

2.5 seconds

 

exceeds 158 °F (70 °C) in HEAT mode.

circuit and refrigerant

OFF

 

Temperature of defrost thermistor

amount.

 

 

 

 

exceeds 158 °F (70 °C) in COOL

•Check stop valve.

 

 

 

 

mode.

 

 

 

 

7-time flash

Fin temperature/ P.C. board

7-time flash

Temperature of fin temperature

•Check around outdoor

 

 

2.5 seconds

temperature

2.5 seconds OFF

thermistor on the inverter P.C. board

unit.

 

 

 

OFF

 

 

exceeds 167 ~ 176 °F (75 ~ 80 °C), or

•Check outdoor unit air

 

 

 

temperature of P.C. board temperature

passage.

"Check

 

 

 

thermistor on the inverter P.C. board

•Refer to 10-5.

 

 

 

 

exceeds 158 ~ 167 °F (70 ~ 75 °C).

of outdoor fan motor".

 

 

 

 

 

 

 

 

 

 

8-time flash

Outdoor fan motor

 

Outdoor fan has stopped 3 times in a

•Refer to 10-5.

"Check

 

2.5 seconds

 

row within 30 seconds after outdoor

of outdoor fan motor".

OFF

 

fan start-up.

Refer to 10-5.

"Check

 

 

 

 

of inverter P.C. board".

 

 

9-time flash

Nonvolatile memory data

5-time flash

Nonvolatile memory data cannot be

•Replace the inverter

OFF

 

2.5 seconds OFF

read properly.

P.C. board.

 

2.5 seconds

 

 

 

 

10-time flash

Discharge temperature

 

Temperature of discharge temperature

•Refer to 10-5.

"Check

 

 

2.5 seconds

 

thermistor has been 122 °F (50 °C) or

of LEV".

 

OFF

 

less for 20 minutes.

•Check refrigerant

 

 

 

 

circuit and refrigerant

 

 

 

 

 

amount.

 

 

 

11-time flash

DC voltage

8-time flash

DC voltage of inverter cannot be

•Refer to 10-5.

"How

 

 

2.5 seconds

 

2.5 seconds OFF

detected normally.

to check inverter/

 

OFF

 

 

 

compressor".

 

Each phase current of

9-time flash

Each phase current of compressor

 

 

compressor

2.5 seconds OFF

cannot be detected normally.

 

 

 

 

 

 

 

 

 

 

 

12-time flash

Overcurrent Compressor

10-time flash

Large current flows into intelligent

•Reconnect compressor

 

 

2.5 seconds

open-phase

2.5 seconds OFF

power module (IPM).

connector.

"How

 

 

OFF

 

 

The open-phase operation of

•Refer to 10-5.

 

 

 

 

 

compressor is detected.

to check inverter/

 

 

 

The interphase short out occurs in the

compressor".

 

 

 

 

output of the intelligent power module

 

 

 

 

 

 

(IPM).

 

 

 

 

 

 

 

The compressor winding shorts out.

 

 

 

 

 

 

 

 

 

 

 

14-time flash

Stop valve (Closed valve)

14-time flash

Closed valve is detected by

•Check stop valve

OFF

 

2.5 seconds OFF

compressor current.

 

 

2.5 seconds

 

 

 

 

 

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).

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Black & Decker MUZ-FD12NA- U1, MUZ-FD09NA- U1 service manual Outdoor unit failure mode table