Mitsubishi Electronics MUZ-D30NA, MUZ-D36NA, MUY-D36NA, U1 Outdoor unit failure mode table

Page 23

3. Outdoor unit failure mode table

MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA

 

 

LED indication

 

 

 

 

The left lamp of OPERA-

Abnormal point

(Outdoor P.C.

 

 

 

Indoor/outdoor

TION INDICATOR lamp

board)

Condition

Correspondence

unit failure mode

(Failure mode / protection)

(Indoor unit)

 

 

 

 

 

recall function

 

LED 1

LED 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

Non (Normal)

 

 

 

 

 

 

 

 

 

 

 

 

IPM protection stop or lock protection stop is continuously

• Check the connection of the

 

 

 

 

 

compressor connecting wire.

 

2-time flash

Outdoor power system

Lighting

Lighting

performed 3 times within 1 minute after the compres-

• Refer to 10-5.

"How to check

sor gets started, or converter protection stop or bus-bar

inverter / compressor".

 

 

 

 

voltage protection stop is continuously performed 3 times

• Refer to 10-5.

"Check of

 

 

 

 

within 3 minutes after start-up.

compressor start failure".

 

 

 

 

 

 

• Check the stop valve.

 

 

 

 

 

 

 

 

 

 

Discharge temperature thermistor

Lighting

Once

 

 

 

 

 

 

 

 

 

 

 

 

 

Defrost thermistor (MUZ)

Lighting

Once

 

• Refer to 10-5.

"Check of

 

 

 

 

 

 

 

 

Ambient temperature thermistor

Lighting

Twice

 

outdoor thermistors".

 

 

 

 

3-time flash

 

 

 

Thermistor shorts or opens during compressor running.

 

 

Fin temperature thermistor

Lighting

3 times

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.C. board temperature thermistor

Lighting

4 times

 

• Replace the outdoor electronic

 

 

 

control P.C. board.

 

 

 

 

 

 

 

 

Outdoor heat exchanger tempera-

Lighting

9 times

 

• Refer to 10-5.

"Check of

 

 

ture thermistor

 

outdoor thermistors".

 

 

 

 

 

 

 

 

 

 

 

• Reconnect compressor con-

 

 

 

 

 

 

nector.

"How to check

 

 

 

 

Goes

 

• Refer to 10-5.

 

4-time flash

Overcurrent

Once

28 A current flow into intelligent power module.

inverter/ compressor."

out

 

 

 

 

• Refer to 10-5.

"Check of

 

 

 

 

 

 

 

 

 

 

 

 

compressor start failure".

 

 

 

 

 

 

• Check the stop valve.

 

 

 

 

 

Temperature of discharge temperature thermistor exceeds

• Check refrigerant circuit and

 

5-time flash

Discharge temperature

Lighting

Lighting

241 °F (116 °C), compressor stops. Compressor can

refrigerant amount.

restart if discharge temperature thermistor reads 212 °F

• Refer to 10-5.

"Check of

 

 

 

 

(100 °C) or less 3 minutes later.

LEV".

 

 

 

 

 

 

 

 

 

6-time flash

High pressure

Lighting

Lighting

The outdoor heat exchanger temperature exceeds 158 °F

• Check refrigerant circuit and

(70 °C) during cooling or the indoor gas pipe temperature

refrigerant amount.

 

 

 

 

exceeds 158 °F (70 °C) during heating (MUZ).

• Check the stop valve.

 

 

 

 

 

 

 

 

 

Fin temperature

3 times

Goes

The fin temperature exceeds 189 °F (87 °C) during opera-

• Check around outdoor unit.

 

 

 

 

out

tion.

• Check outdoor unit air pas-

 

7-time flash

 

 

 

 

sage.

 

 

 

 

 

 

 

P.C. board temperature

4 times

Goes

The P.C. board temperature exceeds 158 °F (70 °C) during

• Refer to 10-5.

"Check of

 

 

out

operation.

outdoor fan motor".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-time flash

Outdoor fan motor

Lighting

Lighting

Failure occurs continuously 3 times within 30 seconds

• Refer to 10-5.

"Check of

after the fan gets started.

outdoor fan motor".

 

 

 

 

 

 

 

 

 

 

 

 

9-time flash

Nonvolatile memory data

Lighting

5 times

Nonvolatile memory data cannot be read properly.

• Replace the outdoor electronic

control P.C. board.

 

 

 

 

 

 

 

 

 

The frequency of the compressor is kept 80 Hz or more

• Check refrigerant circuit and

 

 

 

 

 

refrigerant amount.

 

10-time flash

Discharge temperature

Lighting

Lighting

and the discharge temperature is kept under 102 °F (39 °C)

• Refer to 10-5.

"Check of

 

 

 

 

for more than 20 minutes.

LEV".

 

 

 

 

 

 

 

 

 

 

 

 

 

Communication error occurs between the electronic control

• Check the connecting wire

 

Communication error between

 

 

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

between outdoor electronic

 

Lighting

6 times

 

control P.C. board and power

 

 

P.C. boards

The communication between boards protection stop is

 

 

 

board.

 

 

 

 

 

continuously performed twice.

 

 

 

 

 

 

A short or open circuit is detected in the current sensor

• Replace the power board.

 

 

 

 

during compressor operating.

 

 

 

Current sensor

Lighting

7 times

 

 

 

11-time flash

Current sensor protection stop is continuously performed

 

 

 

 

 

 

 

 

 

 

 

twice.

 

 

 

 

 

 

Zero cross signal cannot be detected while the compres-

• Check the connecting wire

 

 

 

 

sor is operating.

among electronic control P.C.

 

Zero cross detecting circuit

5 times

Goes out

 

board, noise filter P.C. board

 

 

The protection stop of the zero cross detecting circuit is

and power board.

 

 

 

 

 

 

 

 

 

 

continuously performed 10 times.

 

 

 

 

 

 

 

 

 

 

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

23

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Contents Outdoor Unit Page Part Names and Functions Technical ChangesTNB220FMCHT TotalHspf COPSeer Operating RangeARI Required Space Outlines and DimensionsWiring Diagram MUY-D30NA MUY-D36NA LEV Refrigerant System DiagramMAX. Refrigerant Piping Length and MAX. Height Difference Performance Data Cooling Capacity DataHeating Performance Curve CoolingMUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NACondensing Pressure Cooling 380 420 340 300 26068 100 105F MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Standard Operation DataInput correction factors Test RUN Operation How to operate fixed-frequency operation Relation between main sensor and actuator Actuator ControlOutdoor FAN Motor Control R.V. Coil Control MUZPRE-HEAT Control Service FunctionsChange in Defrost Setting Take care of the following during servicing TroubleshootingFailure Mode Recall Function Operational procedure Outdoor unit failure mode table LED LED1 LED2 Troubleshooting Check TableMUZ YLW BRN BLK WHT WHT REDTroubleshooting Flow How to check inverter/ compressorCheck of outdoor thermistors Heating operation does not work Check of R.V. coil MUZ-D30/36Check of outdoor fan motor Check of power supplyCheck of LEV Check of compressor start failureHow to check miswiring and serial signal error Check of HPS Electromagnetic noise enters into TV sets or radios Outdoor electronic control P.C. board Test Point Diagram and VoltageNoise filter P.C. board CN5 Outdoor power boardCN2 CN3Removing the cabinet Photo Disassembly InstructionsHPS Photo 5 Inverter assemblyRemoving R.V. coil MUZ MUZ Temperature thermistor and ambient temperatureThermistor Removing outdoor fan motorRemoving the reactor Removing the compressor and 4-way valve PhotoPage Specifications subject to change without notice

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