Troubleshooting - Trane 4TTS6036A3000A Installer's Manual

Troubleshooting

Wait 3 minutes and
check contactor
coil again
YES
If applicable, is TDR
NO
input voltage
present
NO
Check ID Low
voltage
transformer
26
Compressor fails to start
Contactor check
Is contactor
YES
engergized?
(contacts closed)
NO
Check for 24 volts AC
across contactor coil
Is voltage
YES
present at
contactor coil?
NO
Check control
transformer and
control fuse
Is the control
YES
transformer
and fuse good?
NO
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
Go To: Compressor won't run
Replace contactor
Jumper R to Y low
Does the
voltage terminals
contactor
at thermostat sub
energize?
base.
Repair or replace
connecting wiring
Replace the room
YES
thermostat
NO
18-BC103D1-1B-EN