Section 17. Troubleshooting - Trane 4TWR6 Series Installation And Operation Manual

Section 17. Troubleshooting

Compressor fails to start
Contactor check
Is contactor
energized?
(contacts closed)
NO
Check for 24 volts AC
across contactor coil
Is voltage
present at
contactor coil?
NO
Check control
transformer and
control fuse
Is the control
transformer
and fuse good?
NO
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
20
YES
Go To: Compressor won't run
YES
Replace contactor
Jumper R to Y low
YES
voltage terminals
at thermostat sub
base.
Does the
YES
contactor
energize?
NO
Repair or replace
connecting wiring
Replace the room
thermostat
18-AC104D1-1G-EN