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Problem Possible Cause Action
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 fl 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 fl ow through condenser coil
Check for proper fan speed or blocked
condenser
Compressor running abnormally hot
Check for kinked discharge line or restricted
condenser. Check amperage
Problem Possible Cause Action
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
Problem Possible Cause Action
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
Problem Possible Cause Action
Water leaks into the
room
Evaporator drain pan overfl owing Clean obstructed drain trough
Condensation forming on base pan
Evaporator drain pan broken or cracked. Reseal
or replace
Poor installation resulting in rain entering the
room
Check installation instructions. Reseal as
required
Condensation on discharge grille louvers
Clean the dirty evaporator coil. Use pressure
wash or biodegradable cleaning agent to clean
Chassis gasket not installed Install gasket, per Installation manual
Downward slope of unit is too steep Refer to installation manual for proper installation
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS