Mitsubishi Electric Mr. Slim MUZ-D30NA Service Manual

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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?
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
Normal
Replace the outdoor electronic
control P.C. board.
Replace the LEV coil.
Yes
No
No
Yes
F Check of compressor start failure
After the compressor is heated with a drier,
does the compressor start?
1
Replace the compressor.
Compressor start failure. Activate pre-heat control.
(Refer to 9-1. "PRE-HEAT CONTROL")
No
Yes
Does the compressor run for 10 seconds or
more after it starts?
Check the refrigerant circuit.
Check the stop valve.
Yes
No
Con rm that 1~4 is normal.
•Electrical circuit check
Contact of lead wire leading to compressor
Output voltage of the outdoor electronic control P.C. board and balance of them
(See 10-5. )
Direct current voltage to the outdoor electronic control P.C. board
Voltage between outdoor terminal block S1-S2
1.
2
.
3.
4.
1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Heating part