9
coolinG onlY room air conditionerS: troUBleSHootinG tiPS
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Compressor runs
for short periods
only. Cycles on
overload
Overload inoperative. Opens too
soon
Check operation of unit. Replace overload if
system operation is satisfactory
Compressor restarted before
system pressures equalized
Allow a minimum of 2 minutes to allow
pressures to equalize before attempting to
restart. Instruct customer of waiting period
Low or
uctuating voltage
Check voltage with unit operating. Check for
other appliances on circuit.
Air conditioner
should be in separate circuit for proper voltage
& fused separately
Incorrect wiring
Refer to appropriate wiring diagram
Shorted or incorrect capacitor
Check by substituting a known good capacitor
of correct rating
Restricted or low air
ow through
condenser coil or evaporator coil
Check for proper fan speed or blocked
coils
Compressor running abnormally
hot
Check for kinked discharge line or restricted
condenser
. Check amperage
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T
-stat does not
turn unit on
Loss of charge in t-stat bulb
Place jumper across t-stat terminals to check if
unit operates. If unit operates, replace t-stat.
Loose or broken parts in t-stat
Check as above
Incorrect wiring
Refer to appropriate wiring diagram
Defective thermistor
Replace thermistor or electronic control board
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Noisy operation
Poorly installed
Refer to Installation Manual for proper
installation
Fan blade striking chassis
Reposition - adjust motor mount
Compressor vibrating
Check that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing
Improperly mounted or loose
cabinet parts
Check assembly & parts for looseness,
rubbing & rattling
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W
ater leaks into
the room
Evaporator drain pan over
owing
Clean obstructed drain trough
Condensation forming on base pan
Evaporator drain pan broken or cracked.
Reseal or replace. No chassis gasket installed.
Install chassis gasket
Poor installation resulting in rain
entering the room
Check installation instructions. Reseal as
required
Condensation on discharge grille
louvers
Dirty evaporator coil. Use pressure wash
or biodegradable cleaning agent to clean.
Environmental phenomena: point supply
louvers upward
Chassis gasket not installed
Install gasket, per Installation manual
Downward slope of unit is too
steep inward
Refer to installation manual for proper
installation
