Mitsubishi Electronics MUY-D30NA, MUZ-D36NA, MUY-D36NA, U1, MUZ-D30NA Check of outdoor thermistors

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OPERATION INDICATOR lamp flashes 6-times.

Thermistor is abnormal.

B Check of outdoor thermistors

Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor.

 

 

 

 

 

 

 

 

 

Replace the thermistor except RT64.

Is the thermistor normal? (Refer to 10-6.1.)

 

 

 

 

When RT64 is abnormal, replace the

No

 

Yes

 

outdoor power board.

 

 

 

 

 

 

 

 

 

 

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Does the unit operate for 10 minutes or more

 

 

 

 

 

 

 

Replace the outdoor power board.

 

without showing thermistor abnormality?

 

No

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK.

 

 

 

 

 

 

 

 

 

 

(Cause is poor contact.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermistor

Symbol

 

 

Connector, Pin No.

Board

Defrost (MUZ)

RT61

Between CN661 pin1 and pin2

 

 

Discharge temperature

RT62

Between CN661 pin3 and pin4

Outdoor electronic control P.C. board

Outdoor heat exchanger temperature

RT68

Between CN661 pin7 and pin8

 

 

Ambient temperature

RT65

Between CN663 pin1 and pin2

 

 

Fin temperature

RT64

Between CN3 pin1 and pin2

Outdoor power board

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Contents Outdoor Unit Page Part Names and Functions Technical ChangesHspf TotalCOP TNB220FMCHTSeer 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 DataMUZ-D30NA MUZ-D36NA MUY-D30NA Performance Curve CoolingMUY-D36NA HeatingCondensing 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 Outdoor FAN Motor Control Actuator ControlR.V. Coil Control MUZ Relation between main sensor and actuatorPRE-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 CN2 Outdoor power boardCN3 CN5Removing the cabinet Photo Disassembly InstructionsHPS Photo 5 Inverter assemblyRemoving R.V. coil MUZ Thermistor Temperature thermistor and ambient temperatureRemoving outdoor fan motor MUZRemoving the reactor Removing the compressor and 4-way valve PhotoPage Specifications subject to change without notice

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