Friedrich KUHL R-410A User Manual
Page 62
61
COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Possible Solution
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Compressor runs
for short periods
only. Cycles on
overload
Overload inoperative. Opens too
soon
Check operation of unit. Replace overload if
system operation is satisfactory
Compressor restarted before
system pressures equalized
Control’s default of 3 minutes wait delay timer
inoperative. Replace board.
Low or fl uctuating voltage
Check voltage with unit operating. Check for
other appliances on circuit. Air conditioner
should be in a dedicated circuit for proper
voltage & fused separately
Incorrect wiring
Refer to appropriate wiring diagram
Shorted or incorrect capacitor
Test capacitor and replace if needed.
Restricted or low air flow through
condenser coil or evaporator coil
Check for proper fan speed or blocked
coils. Correct as needed.
Compressor running abnormally
hot
Check for kinked discharge line or restricted
condenser. Refrigerant overcharge. Check
amperage, connections.
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Unit does not
turn on
No power
Check power supply. Check LCDI plug. Check
wire connections. Check if panel is locked.
Incorrect wiring
Refer to appropriate wiring diagram
Defective thermistor
Replace thermistor or electronic control board
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Noisy operation
Poorly installed
Refer to Installation Manual for proper
installation
Fan blade striking chassis
Reposition - adjust motor mount
Compressor vibrating
Check that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing
Improperly mounted or loose
cabinet parts refrigerant tubes
Check assembly & parts for looseness,
rubbing & rattling pipes, etc.
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Water leaks into
the room
Evaporator drain pan overfl owing
Clean obstructed drain trough
Condensation forming underneath
base pan
Evaporator drain pan broken or cracked.
Reseal or replace. No chassis gasket installed.
Install chassis gasket
Poor installation resulting in rain
entering the room
Check installation instructions. Reseal as
required
Condensation on discharge grille
louvers
Dirty evaporator coil. Use pressure wash
or biodegradable cleaning agent to clean.
Environmental phenomena: point supply
louvers upward. Put on high fan.
Chassis gasket not installed
Install gasket, per Installation manual
Downward slope of unit is too
steep inward
Refer to installation manual for proper
installation
Possible Solution
Possible Solution
Possible Solution