noitcA esuaC elbissoP melborP
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
noitcA esuaC elbissoP melborP
Excessive
moisture
Insuffi 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
noitcA esuaC elbissoP melborP
T-stat or
thermistor
short cycles
Defective thermistor Replace thermistor or electronic control board
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
noitcA esuaC elbissoP melborP
Prolonged off
cycles (automatic
operation)
Heat anticipator (resistor) wire
disconnected at t-stat or system
switch
Refer to appropriate wiring diagram
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
Partial loss of charge in t-stat bulb
causing a wide differential
Replace t-stat
Defective thermistor Replace thermistor or electronic control board
noitcA esuaC elbissoP melborP
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
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