Friedrich KUHL R-410A Service Manual page 60
115 & 208-230-volt cool only, 208-230-volt cool with electric heat, 208-230-volt heat pump with electric heat, 115-volt heat pump
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Also See for KUHL R-410A:
- Service manual (47 pages) ,
- Parts manual (16 pages) ,
- Service and parts manual (17 pages)
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COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
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Low voltage
Temperature not set cold enough or
room air thermistor inoperative
Compressor hums but cuts off on
Compressor
overload
does not run
Open or shorted compressor
windings
Open overload
Open capacitor
Inoperative system button
Broken, loose or incorrect wiring
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Inoperative system button
Broken, loose or incorrect wiring
Fan motor
Open capacitor
does not run
Fan speed button defective
Inoperative fan motor
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Undersized unit
Indoor ambient thermistor open
or shorted
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
Low capacity - undercharge
Compressor not pumping properly
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Possible Solution
Check voltage at compressor. 115V & 230V
units will operate at 10% voltage variance
Set temperature to lower than ambient position.
Test thermistor and replace 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 switch or electronic board.
Refer to appropriate wiring diagrams to check
wiring. Correct as needed.
Possible Solution
Test button & replace user interface if inoperative
Refer to applicable wiring diagram
Test capacitor & replace if inoperative
Replace user interface if inoperative
Test fan motor & replace if inoperative (be sure
internal overload has had time to reset)
Possible Solution
Refer to industry standard sizing chart
See alarms and replace thermistor if needed.
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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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