Mitsubishi Electric MXZ-3C30NA Service Manual page 78

• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit gets warm.
Check of LEV
Turn ON the 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 LEV coil with your hand?
No
Disconnect the connectors.
CN791: LEV A, CN792: LEV B, CN793: LEV C
(MXZ-3C/4C/5C), CN794: LEV D (MXZ-4C/5C),
CN795: LEV E (MXZ-5C)
Is there normal resistance to LEV coil?
(Refer to 11-5.)
No
Replace LEV coil.
OBH702E
Yes
Normal
Yes
Replace the outdoor control P.C. board.
78
CN791
CN792
Outdoor
CN793
control
CN794
P.C. board
CN795