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50
TROUBLESHOOTING CHART
Complaint
System
Operating
Pressures
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYM
PT
O
M
S
ys
tem
w
ill
n
ot
s
tar
t
C
om
pr
es
sor
w
ill
no
t s
ta
rt -
fan
run
s
C
om
p.
an
d C
ond.
F
an w
ill
not
s
tar
t
E
vapo
rat
or
fa
n w
ill
not
s
tar
t
C
on
den
se
r f
an w
ill
not
s
tar
t
C
om
pr
es
sor
runs
- goe
s of
f on
ov
er
load
C
om
pr
es
sor
c
yc
les
o
n o
ve
rloa
d
S
ys
tem
run
s
co
nt
inuo
us
ly
- l
itt
le
co
ol
ing/
ht
g
To
o c
oo
l a
nd
the
n t
oo
w
ar
m
N
ot
c
ool
en
oug
h o
n w
ar
m
day
s
C
er
tai
n ar
eas
to
o c
oo
l,
ot
her
s t
oo w
ar
m
C
om
pr
es
sor
is
no
is
y
S
ys
tem
run
s
- bl
ow
s c
ol
d ai
r i
n he
at
ing
U
ni
t w
ill
not
te
rm
inat
e d
ef
ro
st
U
ni
t w
ill
not
de
fros
t
Low
s
uc
tion
pr
es
sur
e
Lo
w
he
ad pr
es
sur
e
H
ig
h
suc
tion pr
es
sur
e
H
ig
h h
ead
pr
es
sur
e
Test Method
Remedy
See S
er
vi
ce P
ro
ced
ur
e R
ef
.
Pow er Failure
•
Test Voltage
S-1
Blow n Fuse
•
• •
Inspect Fuse Size & Type
S-1
Unbalanced Pow er, 3PH
•
• •
Test Voltage
S-1
Loose Connection
•
•
•
Inspect Connection - Tighten
S-2, S-3
Shorted or Broken Wires
• • • • • •
Test Circuits With Ohmmeter
S-2, S-3
Open Fan Overload
• •
Test Continuity of Overload
S-17A
Faulty Thermostat
•
• •
•
Test Continuity of Thermostat & Wiring
S-3
Faulty Transformer
•
•
Check Control Circuit w ith Voltmeter
S-4
Shorted or Open Capacitor
•
• • • •
Test Capacitor
S-15
Internal Compressor Overload Open
•
♦
Test Continuity of Overload
S-17A
Shorted or Grounded Compressor
•
•
Test Motor Windings
S-17B
Compressor Stuck
•
• •
♦
Use Test Cord
S-17D
Faulty Compressor Contactor
•
• •
Test Continuity of Coil & Contacts
S-7, S-8
Faulty Fan Relay
•
Test Continuity of Coil And Contacts
S-7
Open Control Circuit
•
Test Control Circuit w ith Voltmeter
S-4
Low Voltage
•
• •
Test Voltage
S-1
Faulty Evap. Fan Motor
•
•
♦
Repair or Replace
S-16
Shorted or Grounded Fan Motor
•
•
Test Motor Windings
S-16
Improper Cooling Anticipator
•
•
Check Resistance of Anticipator
S-3B
Shortage of Refrigerant
• •
♦
• •
Test For Leaks, Add Refrigerant
S-101,103
Restricted Liquid Line
• •
• •
•
Remove Restriction, Replace Restricted Part
S-112
Open Element or Limit on Elec. Heater
♦
♦
Test Heater Element and Controls
S-26,S-27
Dirty Air Filter
•
• •
•
♦
Inspect Filter-Clean or Replace
Dirty Indoor Coil
•
• •
•
♦
Inspect Coil - Clean
Not enough air across Indoor Coil
•
• •
•
♦
Check Blow er Speed, Duct Static Press, Filter
S-200
Too much air across Indoor Coil
♦
•
Reduce Blow er Speed
S-200
Overcharge of Refrigerant
• •
•
♦
• •
Recover Part of Charge
S-113
Dirty Outdoor Coil
• •
•
♦
•
Inspect Coil - Clean
Noncondensibles
•
•
♦
•
Recover Charge, Evacuate, Recharge
S-114
Recirculation of Condensing Air
•
•
•
Remove Obstruction to Air Flow
Infiltration of Outdoor Air
•
• •
Check Window s, Doors, Vent Fans, Etc.
Improperly Located Thermostat
•
•
Relocate Thermostat
Air Flow Unbalanced
•
•
Readjust Air Volume Dampers
System Undersized
•
•
Refigure Cooling Load
Broken Internal Parts
•
♦
Replace Compressor
S-115
Broken Valves
•
•
• •
Test Compressor Efficiency
S-104
Inefficient Compressor
•
♦
• •
Test Compressor Efficiency
S-104
Wrong Type Expansion Valve
• • •
•
• •
♦
Replace Valve
S-110
Expansion Device Restricted
• • •
•
• •
•
Remove Restriction or Replace Expansion Device
S-110
Oversized Expansion Valve
•
•
Replace Valve
Undersized Expansion Valve
• • •
•
•
Replace Valve
Expansion Valve Bulb Loose
•
•
Tighten Bulb Bracket
S-105
Inoperative Expansion Valve
•
•
•
Check Valve Operation
S-110
Loose Hold-dow n Bolts
•
Tighten Bolts
Faulty Reversing Valve
•
♦ ♦ ♦
♦ ♦ ♦
Replace Valve or Solenoid
S-21, 122
Faulty Defrost Control
•
♦ ♦ ♦ ♦ ♦
♦
Test Control
S-24
Faulty Defrost Thermostat
♦ ♦ ♦ ♦ ♦ ♦ ♦
Test Defrost Thermostat
S-25
Flow rator Not Seating Properly
•
• •
Check Flow rator & Seat or Replace Flow rator
S-111
•
Cooling or Heating Cycle (Heat Pump)
♦
COOLING/HP ANALYSIS CHART
No Cooling
Unsatisfactory
Cooling/Heating
Heating Cycle Only (Heat Pump)
Содержание DAR09
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