Trane CXAJ series Installation, Operation And Maintenance Manual page 55

The compressors make sounds but cannot be started
Possible Cause
(1) The compressor voltage is
too low.
(2) The compressor is faulty.
(3) The starting voltage is
insufficient (for the single-phase
unit).
The second compressor cannot be started
Possible Cause
(1) There is no refrigeration or
heating signal.
(2) The microcomputer has
no compressor control signal
output.
(3) The electromagnetic switch of
the compressor does not excite.
The operating period of the compressor is too short
Possible Cause
(1) Intermittent connection of
control circuit
Handling Method
Inspect the following items:
a. Certain fuse is blown out.
b. The supply voltage is too low.
c. The electromagnetic contactor of the compressor is faulty.
d. The wire connection is loose.
Inspect the following items:
a. The motor winding is open-circuited.
b. The current of each phase is too high.
Inspect the following items:
a. The starting capacitor is poor.
b. The starting relay is poor.
Handling Method
Inspect the following items:
a. The temperature switch is damaged.
b. The control wire current is possible improper.
See the item (3) in Section A
See the item (4) in Section A
Handling Method
Inspect the following items:
a. The contact of the contactor is poor.
b. The wire connection is loose.
Troubleshooting
55