Mitsubishi Electric MXZ-3E54VA-E1 Service Manual page 96

• 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-3E/4E/5E),
CN794: LEV D (MXZ-4E/5E),
CN795: LEV E (MXZ-5E)
CN797: LEV R (MXZ-3E/4E72)
Is there normal resistance to LEV coil?
(Refer to 11-5.)
No
Replace LEV coil.
OBH723D
Yes
Normal
Yes
Replace the outdoor control P.C. board.
96
CN791
CN792
Outdoor
CN793
control
CN794
P.C. board
CN795