9
Troubleshooting Information
For detailed service information refer to the Remote Condensing Unit Service manual.
Complaint
Unsatisfactory
Cooling
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SY
M
P
T
O
M
Sy
s
tem
wi
ll
not s
ta
rt
C
o
mpr
e
sso
r
w
ill
no
t star
t -
fan
r
u
ns
Co
mpr
e
s
s
o
r
and C
onden
s
e
r F
an w
ill
not s
tar
t
Ev
apor
at
or
fan w
ill
not s
tar
t
Co
ndens
er
fan w
ill
not s
tar
t
Co
mpr
e
s
s
o
r
run
s
-
goes
off on o
v
er
lo
a
d
C
o
m
p
re
sso
r
cycl
e
s
o
n
o
v
e
rl
o
a
d
Sy
s
tem
r
uns
c
o
nti
n
u
ous
ly
-
l
it
tl
e c
o
ol
in
g
T
oo c
o
ol
an
d then
too w
a
rm
No
t c
ool
enou
gh on w
a
rm
da
y
s
Ce
rt
ai
n a
rea
s
to c
o
ol
ot
her
s
to w
a
rm
Co
m
p
re
s
s
o
r is
n
o
is
y
L
o
w
su
ct
io
n
p
re
ssu
re
Low
head
pr
es
s
u
re
H
ig
h
su
cti
o
n
p
re
ssu
re
Hi
gh he
ad pr
es
s
u
re
Test Method
Remedy
Power Failure
•
Test Voltage
Blown Fuse
•
•
•
Impact Fuse Size & Type
Loose Connection
•
•
•
•
Inspect Connection - Tighten
Shorted or Broken Wires
•
•
•
•
•
•
Test Circuits with Ohmmeter
Open Overload
•
•
Test Continuity of Overloads
Faulty Thermostat
•
•
•
•
Test Continuity of Thermostat and Wiring
Faulty Transformer
•
•
Check Control Circuit with Voltmeter
Shorted or Open Capacitor
•
•
•
•
Test Capacitor
Internal Compressor Overload Open
•
Test Continuity of Overload
Shorted or Grounded Compressor
•
•
Test Motor Windings
Compressor Stuck
•
•
Use Test Cord
Faulty Compressor Contactor
•
•
•
•
Test Continuity of Coil and Contacts
Faulty Fan Relay
•
Test Continuity of Coil and Contacts
Open Control Circuit
Test Control Circuit with Voltmeter
Low Voltage
•
•
•
Test Voltage
Faulty Evaporator Fan Motor
•
•
Repair or Replace
Shorted or Grounded Fan Motor
•
•
•
Test Motor Windings
Improper Cooling Anticipator
•
Check Resistance of Anticipator
Shortage or Refrigerant
•
•
•
•
Test For Leaks, Add Refrigerant
Restricted Liquid Line
•
•
•
•
Replace Restricted Part
Undersized Liquid Line
•
•
•
Replace Line
Undersized Suction Line
•
Replace Line
Not Enough Air across Indoor Coil
•
•
•
•
Speed Blower, Check Duct Static Pressure
Too Much Air across Indoor Coil
•
Reduce Blower Speed
Overcharge of Refrigerant
•
•
•
•
•
Recover Part of Charge
Noncondensibles
•
•
•
Recover Charge, Evacuate, Recharge
Recirculation of Condensing Air
•
•
•
Remove Obstruction to Air Flow
Infiltration of Outdoor Air
•
•
•
Check Windows, 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
Broken Valves
•
Test Compressor Efficiency
Inefficient Compressor
•
•
•
Test Compressor Efficiency
High Pressure Control Open
•
Reset and Test Control
Unbalanced Power, 3PH
•
•
•
Test Voltage
Wrong Type Expansion Valve
•
•
•
Replace Valve
Expansion Valve Restricted
•
•
•
•
•
•
Replace Valve
Oversized Expansion Valve
•
•
Replace Valve
Undersized Expansion Valve
•
•
•
•
•
Replace Valve
Expansion Valve Bulb Loose
•
•
Tighten Bulb Bracket
Inoperative Expansion Valve
•
•
•
Check Valve Operation
Loose Hold-down Bolts
•
Tighten Bolts
No Cooling
System
Operating
Pressures
NOTICE
UNITS WITH ROTARY OR RECIPROCATING COMPRESSORS AND NON-BLEED
TXV’S REQUIRE A HARD START KIT.
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