Mitsubishi Electronics MUZ-D30NA, MUZ-D36NA, U1 How to check miswiring and serial signal error

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Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate.

OPERATION INDICATOR lamp flashes ON and OFF in every 0.5 seconds. Outdoor unit doesn’t operate.

H How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the

 

 

 

 

 

Check the power supply.

power supply?

No

 

 

 

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and

S2?No

Yes

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICA- TOR lamp light up? <Confirmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Check the wiring.

No

Is there any miswiring, poor contact, or wire disconnec-

No tion of the indoor/outdoor Yes Correct them. connecting wire?

Is fuse (F65) broken? No

Outdoor electronic control P.C. board (Parts side)

A

Turn OFF the power supply.

Check once more if the indoor/outdoor B connecting wire is not miswiring.

Short-circuit outdoor terminal block S2 and S3. 1

Turn ON the power supply.

1. Miswiring may damage indoor electronic control P.C. board during the operation.

Be sure to confirm the wiring is correct before the opera- tion starts.

3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes.

LED2 LED1

Lighted Blinking

A

Turn OFF inverter-controlled lighting equipment.

Turn OFF the power supply and then turn ON again.

Press EMERGENCY OPERATION switch.

Does the LED on the inverter P.C. board or

 

 

 

 

 

Replace the inverter P.C. board or

the outdoor electronic control P.C. board

 

 

 

 

the outdoor electronic control P.C. board.

repeat "3.6-second-OFF and 0.8-second-

No

 

 

2

ON quick blinking"? 3

(Lighted

 

 

 

 

Yes

or not

 

2. Be careful to the residual

 

 

 

lighted)

 

voltage of smoothing capacitor.

 

 

Turn OFF the power supply.

 

Is there any error of the in-

 

 

 

 

Remove the short-circuit between

 

 

 

 

 

outdoor terminal block S2 and S3.

 

door/outdoor connecting wire,

 

 

 

Replace the indoor/

Turn ON the power supply.

 

such as the damage of the wire,

 

 

 

outdoor connecting

No

Yes

Is there amplitude of 10 to 20 VDC

 

intermediate connection, poor

 

 

 

wire.

between outdoor terminal block S2 and

 

contact to the terminal block?

 

 

 

 

 

 

 

 

 

S3? <Confirmation of serial signal>

 

 

No

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Is there any error of the in-

 

 

 

 

Is there rated voltage between

 

 

 

 

 

 

 

 

 

 

 

door/outdoor connecting wire,

 

 

 

Replace the indoor/

Is serial signal error indicated 6 minutes later?

Yes

B

No

Reinstall either the unit or the light each other away.

Attach a filter on remote control receiving section of the indoor unit.

indoor terminal block S1 and S2?

No

such as the damage of the wire,

 

 

outdoor connecting

Yes

<Confirmation of power voltage>

 

intermediate connection, poor

 

 

wire.

 

Yes

 

contact to the terminal block?

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

33

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Contents Outdoor Unit Page Part Names and Functions Technical ChangesHspf TotalCOP TNB220FMCHTOperating Range ARISeer 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 actuatorService Functions Change in Defrost SettingPRE-HEAT Control 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 InstructionsPhoto 5 Inverter assembly Removing R.V. coil MUZHPS 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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