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COOlING ONlY ROOM AIR CONDITIONeRS: TROUBleSHOOTING TIPS
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Low voltage
T-stat not set cold enough or
inoperative
Compressor hums but cuts off on
overload
Open or shorted compressor
Compressor
windings
does not run
Open overload
Open capacitor
Inoperative system switch
Broken, loose or incorrect wiring
P
o r
b
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Inoperative system switch
Broken, loose or incorrect wiring
Fan motor
Open capacitor
does not run
Fan speed switch open
Inoperative fan motor
P
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b
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m
Undersized unit
T-stat open or inoperative
Dirty fi
Dirty or restricted condenser or
evaporator coil
Does not cool or
only cools slightly
Poor air circulation
Fresh air or exhaust air door open
on applicable models
Low capacity - undercharge
Compressor not pumping properly
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Check voltage at compressor. 115V & 230V
units will operate at 10% voltage variance
Set t-stat to coldest position. Test t-stat & re-
place if inoperative
Hard start compressor. Direct test compressor.
If compressor starts, add starting components
Check for continuity & resistance
Test overload protector & replace if inoperative
Test capacitor & replace if inoperative
Test for continuity in all positions. Replace if
inoperative
Refer to appropriate wiring diagrams to check
wiring
A
t c
o i
Test switch & replace if inoperative
Refer to applicable wiring diagram
Test capacitor & replace if inoperative
Test switch & replace if inoperative
Test fan motor & replace if inoperative (be sure
internal overload has had time to reset)
A
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Refer to industry standard sizing chart
Set to coldest position. Test t-stat & replace if
necessary
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Use pressure wash or biodegradable cleaning
agent to clean
Adjust discharge louvers. Use high fan speed
Close doors. Instruct customer on use of this
feature
Check for leak & make repair
Check amperage draw against nameplate. If
not conclusive, make pressure test
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