Trane 4TWX8 Installer's Manual page 24

15.2 Troubleshooting
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback (TXV/EEV)
Liquid Refrig. Floodback
(Cap. Tube)
I.D. Coil Frosting
Compressor Runs
Inadequate or No Cooling/Htg
ELECTRICAL
Compressor & O.D. Fan
Won't Start
Compressor Will Not Start
But O.D. Fan Runs
O.D. Fan Won't Start
Compressor Hums But Won't Start
Compressor Cycles on IOL
I.D. Blower Won't Start
DEFROST
Unit Won't Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
C - Cooling
Trane - by Trane Technologies (NYSE: TT), a global climate innovator - creates comfortable, energy efficient indoor
environments for commercial and residential applications. For more information, please visit trane.com or
tranetechnologies.com.
The AHRI Certified mark indicates Trane U.S. Inc. participation in the AHRI Certification program. For verification of individual certified products,
go to ahridirectory.org.
Trane has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed
to using environmentally conscious print practices.
18-BC91D1-6B-EN 22 May 2020
Supersedes 18-BC91D1-6A-EN (February 2020)
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C P P
H P P
C P S P S
H P S P S
C P P
H P P
C P S
H P S
C P S P S
H P S P S
C P P
H P P
C
H
C
H
C
H
H - Heating P - Primary Causes
S P
S P
S
S
P
P
P
S P
S P
S P S P P
S P S P P
S S P
S S P
S
S
S S P
S S P
S S P S P
S S P S P
S P S S
S P S S
P
P
*
S - Secondary Causes
P P S P S S
P P S P S
S S S S
S S S S
P P S P
S P
S P S
S S S S
P
P
P S S S P
P S S S
S S
S S S P S S
S S P S S
P S S S S S
P S S S P S
S S S
- 3 Phase Only
S P
P
P
S
P
P
S
S S
S
P P P
P
P P
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