coolinG onlY room air conditionerS: troUBleSHootinG tiPS
10
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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 towards back of unit
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
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Excessive
moisture
Insuf
fi
cient air circulation thru area
to be air conditioned
Adjust louvers for best possible air circulation
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Inadequate vapor barrier in building
structure, particularly
fl
oors
Advise customer
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Thermistor
short cycles
Defective thermistor
Replace thermistor or electronic control board
Plenum gasket not sealing,
allowing discharge air to short
cycle unit
Check gasket. Reposition or replace as
needed
Restricted coil or dirty
fi
lter
Clean & advise customer of periodic cleaning
& maintenance needs of entire unit
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Prolonged off
cycles (automatic
operation)
Heat 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
Defective thermistor
Replace thermistor or electronic control board
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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
fi
n
pack
