Trane NTXWPH A Series Service Manual page 83

• 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.
NTXMMX20A122AA NTXMPH20A122AA
CN791: LEV A, CN792: LEV B,
CN797: LEV R
OTHER MODELS
CN791: LEV A, CN792: LEV B, CN793: LEV C
CN794: LEV D (NTXMMX36A142AA/42A152AA),
CN795: LEV E (NTXMMX42A152AA),
Is there normal resistance to LEV coil?
(Refer to 11-5.)
No
Replace LEV coil.
OBHT702
Yes
Normal
Yes
Replace the outdoor control P.C. board.
83
CN791
CN792
Outdoor
CN793
control
CN794
P.C. board
CN795
CN797