Mitsubishi Electronics U1, MUZ-D36NA, MUY-D36NA Check of compressor start failure, Check of LEV

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F Check of compressor start failure

Conﬁrm that 1~4 is normal. •Electrical circuit check

1.Contact of lead wire leading to compressor

2.Output voltage of the outdoor electronic control P.C. board and balance of them (See 10-5.)

3.Direct current voltage to the outdoor electronic control P.C. board

4.Voltage between outdoor terminal block S1-S2

Does the compressor run for 10 seconds or more after it starts?

No

After the compressor is heated with a drier, does the compressor start? 1

Yes

			Check the refrigerant circuit.
	Yes		Check the stop valve.

			Replace the compressor.
	No		Replace the compressor.
	No

Compressor start failure. Activate pre-heat control. (Refer to 9-1. "PRE-HEAT CONTROL")

1

Heat the compressor with

a drier for about 20 minutes. Do not recover refrigerant gas while heating.

Heating part

When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit gets warm.

G Check of LEV

Turn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.

Is "click - click" sound heard?

Or, do you feel vibration of the LEV coil with a hand? No

Disconnect the connector CN795.

Is there normal resistance to LEV coil?

No

Replace the LEV coil.

			Normal
	Yes		Normal
	Yes

		Replace the outdoor electronic
Yes		control P.C. board.

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Contents

Outdoor Unit Page Technical Changes Part Names and FunctionsTotal HspfCOP TNB220FMCHTSeer Operating RangeARI Outlines and Dimensions Required SpaceWiring Diagram MUY-D30NA MUY-D36NA Refrigerant System Diagram LEVMAX. Refrigerant Piping Length and MAX. Height Difference Data Performance Data Cooling CapacityPerformance Curve Cooling MUZ-D30NA MUZ-D36NA MUY-D30NAMUY-D36NA HeatingCondensing Pressure Cooling 380 420 340 300 26068 100 105F Standard Operation Data MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NAInput correction factors Test RUN Operation How to operate fixed-frequency operation Actuator Control Outdoor FAN Motor ControlR.V. Coil Control MUZ Relation between main sensor and actuatorPRE-HEAT Control Service FunctionsChange in Defrost Setting Troubleshooting Take care of the following during servicingFailure Mode Recall Function Operational procedure Outdoor unit failure mode table LED Troubleshooting Check Table LED1 LED2MUZ BLK WHT WHT RED YLW BRN How to check inverter/ compressor Troubleshooting FlowCheck of outdoor thermistors Check of R.V. coil MUZ-D30/36 Heating operation does not workCheck of power supply Check of outdoor fan motorCheck of compressor start failure Check of LEVHow to check miswiring and serial signal error Check of HPS Electromagnetic noise enters into TV sets or radios Test Point Diagram and Voltage Outdoor electronic control P.C. boardNoise filter P.C. board Outdoor power board CN2CN3 CN5Disassembly Instructions Removing the cabinet PhotoHPS Photo 5 Inverter assemblyRemoving R.V. coil MUZ Temperature thermistor and ambient temperature ThermistorRemoving outdoor fan motor MUZRemoving the compressor and 4-way valve Photo Removing the reactorPage Specifications subject to change without notice