Mitsubishi Electric MXZ-2B30VA 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,
CN794: LEV D, CN795: LEV E, CN796: LEV F.
Is there normal resistance to LEV coil?
(Refer to 11-5.)
No
Replace LEV coil.
OBH554D
Yes
Normal
Yes
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
78
MXZ-2B MXZ-3B/4B/5B
Inverter
CN791
P.C. board
CN792
CN793
CN794
CN795
CN796
Outdoor
electronic
control
P.C. board