Service Manual

36
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Possible Action
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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
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
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Unit short cycles
Defective thermistor Replace thermistor or electronic control board
Unit oversized See sizing chart.
Chassis seal gasket not sealing or
absent causing unit to short cycle
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
Defective indoor ambient air 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
Possible Solution
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