Troubleshooting - Trane 4TWB3018D Installer's Manual

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 H - Heating
18-BC85D1-2
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C P P S P
H P P S P
C P S P S S S
H P S P S S S
C P P S
H P P S
C P S S S
H P S S S
C P S P S S S
H P S P S S S
C P P S P
H P P S P
C
H
C
H
C
H
P - Primary Causes S - Secondary Causes
P P S P
P P S
S P
S P
S P P
S
P
P S
P S
P S
P S
S P S S
S P S
S P P
S P P
P
P
P
P
P S P P S S
P S P P S S
S S
S S
P
P S
*
- 3 Phase Only
S S
P S
S S S S S P
S S S S P
S P P
S P
S P S S
S S S
P P
P P
S S P
S S S
S
S P S S S S
S P S S S
S S S
S P S
P P P
P
S S P P
27