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

Page 19

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.).

19

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Contents MUZ-FD09NA MUZ-FD09NA- U1 MUZ-FD12NA MUZ-FD12NA- U1 Page Part Names and Functions Technical ChangesMUZ-FD09NA MUZ-FD12NA SpecificationOperating Range Test conditionRequired Space Outlines and DimensionsWiring Diagram MAX. Refrigerant Piping Length and MAX. Height Difference Refrigerant System DiagramData MUZ-FD09NA Performance Curve CoolingMUZ-FD09NA MUZ-FD12NA HeatingCondensing pressure Condensing Pressure Cooling65 70F MSZ-FD09NA MSZ-FD12NA Standard Operation DataCorrection of Heating capacity Test RUN Operation How to operate fixed-frequency operationRelation Between Main Sensor and Actuator Actuator ControlOutdoor FAN Motor Control R.V. Coil ControlPRE-HEAT Control Setting Service FunctionsTroubleshooting Change in Defrost SettingOFF Failure Mode Recall FunctionOperational procedure Outdoor unit failure mode table Troubleshooting Check Table Page WHT RED Trouble Criterion of Main Parts MUZ-FD09NAMUZ-FD12NACheck of compressor How to check inverter/ compressorCheck of open phase Troubleshooting FlowCheck of compressor operation time Check of compressor windingCheck of compressor start failure Check of R.V. coil Unit operates Cool mode even if it is set to Heat modeUnit operates Heat mode even if it is set to Cool mode Check of outdoor thermistorsCheck of outdoor fan motor Check of power supplyCheck of LEV Expansion valve Emergency Operation Check of inverter P.C. boardPage Outdoor unit Electromagnetic noise enters into TV sets or radiosInverter P.C. board Test Point Diagram and VoltageRemoving the cabinet Photo Disassembly InstructionsRemoving R.V. coil Removing the inverter assembly, inverter P.C. board PhotoPhoto 4 inverter assembly Photo Removing the discharge temperature thermistorRemoving the compressor and 4-way valve Removing outdoor fan motor PhotoPage New publication, effective Jan