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COOLING ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS
P
o r
b
e l
m
Compressor runs
for short periods
only. Cycles on
overload
P
o r
b
e l
m
T-stat does not
turn unit on
P
o r
b
e l
m
Noisy operation
P
o r
b
e l
m
Water leaks into
the room
P
o
s s
b i
e l
C
a
u
e s
Overload inoperative. Opens too
soon
Compressor restarted before
system pressures equalized
Low or fl uctuating voltage
Incorrect wiring
Shorted or incorrect capacitor
Restricted or low air fl ow through
condenser coil or evaporator coil
Compressor running abnormally
hot
P
o
s s
b i
e l
C
a
u
e s
Loss of charge in t-stat bulb
Loose or broken parts in t-stat
Incorrect wiring
Defective thermistor
P
o
s s
b i
e l
C
a
u
e s
Poorly installed
Fan blade striking chassis
Compressor vibrating
Improperly mounted or loose
cabinet parts
P
o
s s
b i
e l
C
a
u
e s
Evaporator drain pan overfl owing
Condensation forming on base pan
Poor installation resulting in rain
entering the room
Condensation on discharge grille
louvers
Chassis gasket not installed
Downward slope of unit is too
steep inward
A
t c
o i
n
Check operation of unit. Replace overload if
system operation is satisfactory
Allow a minimum of 2 minutes to allow
pressures to equalize before attempting to
restart. Instruct customer of waiting period
Check voltage with unit operating. Check for
other appliances on circuit. Air conditioner
should be in separate circuit for proper voltage
& fused separately
Refer to appropriate wiring diagram
Check by substituting a known good capacitor
of correct rating
Check for proper fan speed or blocked
coils
Check for kinked discharge line or restricted
condenser. Check amperage
A
t c
o i
n
Place jumper across t-stat terminals to check if
unit operates. If unit operates, replace t-stat.
Check as above
Refer to appropriate wiring diagram
Replace thermistor or electronic control board
A
t c
o i
n
Refer to Installation Manual for proper
installation
Reposition - adjust motor mount
Check that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing
Check assembly & parts for looseness,
rubbing & rattling
A
t c
o i
n
Clean obstructed drain trough
Evaporator drain pan broken or cracked.
Reseal or replace. No chassis gasket installed.
Install chassis gasket
Check installation instructions. Reseal as
required
Dirty evaporator coil. Use pressure wash
or biodegradable cleaning agent to clean.
Environmental phenomena: point supply
louvers upward
Install gasket, per Installation manual
Refer to installation manual for proper
installation
43
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Table of Contents
Troubleshooting
