19
15.8 Troubleshooting table
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback
(TXV)
I.D. Coil Frosting
Compressor Runs Inadequate or
No Cooling/Heating
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
I.D. Blower Won’t Start
DEFROST
Unit Won’t Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
AH
W
T
OT
K
CE
HC
ED
OM
OP
R
EW
LP
PU
S
Y
HG
IH
OV
TL
GA
E
G N
IRI
W
COMPRESSR
PA
C
A
TIC
RO
O.D. FAN
P A
C
A
T IC
R O
I.D. BLOWER CAPACITOR
TN
OC
C A
O T
R C
T N
O
C A
S T
OLW
OV
T L
GAE
GNI
RI
W
RT
NO
C
L
O
T
R E
MR
OF
SN
AR
TS
OM
RE
HT
TA
TN
OC
CA
O TR
LI
OC
OL
W
O V
T L
G AE
F
E S
U
KC
UT
S
R O
SS
ER
PM
OC
TN
EIC
IF
FE
NI
M O
C
. P
FE
R
.
E G
RA
HC
RE
DN
U F
ER
.O
EG
RA
HC
RE
V E
VIS
SE
CX
E
V E
P A .
O L
DA SE
LB
AS
NE
DN
OC
NO
N
SE
R
.
. O
.D
OL
FRI
A
W
.O
.D
RI
A
A L
UC
RIC
ER
NO
IT
VX
T
KC
UT
S
NE
PO
AE
HR
EP
US
T
ER
. S
D .I .
O L
FRI
A
W
FE
R
. C
. RI
NO
IT
CIR
TS
ER
S
OS
V
N IK
AE
L
G
OS
V
LI
OC
E VI
TC
EF
ED
KC
EH
C
AV
VL
E
GNI
KA
EL
I.D. CONTROL DEF.
RF
ED
TS
O
R T
NO
C
L
O
F E
D
.
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
P
P
P
P
S
S
S
S
P P
P
S
S
P
P
P
P
P
P
P
P
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
P
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
P
P
P
P
P
P
P
S
S
P
P
P
C- Cooling H - Heating P - Primary Causes S - Secondary Causes
T4
TEMP.
SENSOR DEF.
T3
TEMP.
SENSOR DEF.
HPC/HGS
SENSOR DEF.
LPC
SENSOR DEF.
S
S
P
P
P
P
S
S
S
S
S
S
S
S
S
S
P
S
16.2 Changing motor
When motor requires changing, follow the steps below:
STEP 1 - Go into electrical panel, disconnect motor power lines.
Note:
Disconnect main power to unit. Severe burns and electrical
shock will occur if you do not disconnect main power.
STEP 2 - Remove cover (be careful of motor wires).
STEP 3 - Be sure to place fan cover unit on the ground (Figure 43
).
Note:
Do not place or lean fan blades on ground or against surface.
16. Warranty
16.1 Maintenance
Dirt should not be allowed to accumulate on the indoor or
outdoor coils or other parts in the air circuit. Clean as often as
necessary to keep the unit clean. Use a brush, vacuum
cleaner attachment or other suitable means.
The outdoor fan motor is permanently lubricated and does
not require periodic oiling.
Refer to the furnace or air handler instructions for filter and
blower motor maintenance.
The indoor coil and drain pan should be inspected and
cleaned regularly to assure proper drainage.
It is unlawful to knowingly vent, release or discharge refrigerant
into the open air during repair, service, maintenance or the
final disposal of this unit. When the system is functioning
properly and the owner has been fully instructed, secure the
owner’s approval.
Assist owner with processing Warranty cards and/or online regi-
stration.
