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Problem Possible Cause Action
Water "spitting"
into room
Sublimation: When
unconditioned saturated, outside air mixes with
conditioned air, condensation forms on the cooler
surfaces
Ensure that foam gaskets are installed in
between window panes & in between the unit &
the sleeve. Also, ensure that fresh air/exhaust
vents (on applicable models) are in the closed
position & are in tact
Downward pitch of installation is too steep
Follow installation instructions to ensure that
downward pitch of installed unit is no less than
1/4" & no more than 3/8"
Restricted coil or dirty fi lter
Clean & advise customer of periodic cleaning &
maintenance needs of entire unit
Problem Possible Cause Action
Excessive moisture
Insuffi cient air circulation thru area to be air
conditioned
Adjust louvers for best possible air circulation
Oversized unit Operate in "MoneySaver" position
Inadequate vapor barrier in building structure,
particularly fl oors
Advise customer
Problem Possible Cause Action
T-stat short cycles
T-stat differential too narrow Replace t-stat
Plenum gasket not sealing, allowing discharge air
to short cycle t-stat
Check gasket. Reposition or replace as needed
Restricted coil or dirty fi lter
Clean & advise customer of periodic cleaning &
maintenance needs of entire unit
Problem Possible Cause Action
Prolonged off
cycles (automatic
operation)
Anticipator (resistor) wire disconnected at t-stat
or system switch
Refer to appropriate wiring diagram
Anticipator (resistor) shorted or open
Disconnect plus from outlet. Remove resistor
from bracket. Insert plug & depress "COOL"
& "FAN AUTOMATIC" buttons. Place t-stat to
warmest setting. Feel resistor for temperature. If
no heat, replace resistor
Partial loss of charge in t-stat bulb causing a wide
differential
Replace t-stat
Problem Possible Cause Action
Outside water leaks
Evaporator drain pan cracked or obstructed Repair, clean or replace as required
Water in compressor area
Detach shroud from pan & coil. Clean & remove
old sealer. Reseal, reinstall & check
Obstructed condenser coil
Use pressure wash or biodegradable cleaning
agent to clean
Fan blade/slinger ring improperly positioned Adjust fan blade to 1/2" of condenser coil
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS