Friedrich KCS08A10A Service Manual page 48

Tips continued
COMPLAINT
Electronic control
board does not turn unit off
Compressor runs for short
periods only.
Unit does not turn on
Noisy operation
Water Leaks into Room
48
TROUBLESHOOTING
CAUSE
Compressor relay contacts stuck
Incorrect wiring
Unit undersized for area to be cooled
Defective thermistor
Incorrect wiring
Shorted or incorrect capacitor
Restricted or low air flow through
condenser coil or evaporator coil
Compressor running abnormally hot
No power
Incorrect wiring
Defective thermistor
Poorly installed
Fan blade striking chassis
Compressor vibrating
Improperly mounted or loose cabinet
parts refrigerant tubes
Evaporator drain pan overflowing
Condensation forming underneath
base pan
Poor installation resulting in rain en-
tering the room
Condensation on discharge grille
louvers
Chassis gasket not installed
Downward slope of unit is too steep
inward
SOLUTION
Replace electronic control board
Refer to appropriate wiring diagrams
Refer to industry standard sizing chart
Replace thermistor or electronic control board
Refer to appropriate wiring diagram
Test capacitor and replace if needed.
Check for proper fan speed or blocked coils.
Correct as needed.
Check for kinked discharge line or restricted
condenser. Refrigerant overcharge. Check am-
perage, connections.
Check power supply. Check LCDI plug. Check
wire connections. Check if panel is locked.
Refer to appropriate wiring diagram
Replace thermistor or electronic control board
Refer to Installation Manual for proper instal-
lation
Reposition - adjust motor mount
Check that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing
Check assembly & parts for looseness, rubbing
& rattling pipes, etc.
Clean obstructed drain trough
Evaporator drain pan broken or cracked. Reseal
or replace. No chassis gasket installed. Install
chassis gasket
Check installation instructions. Reseal as re-
quired
Dirty evaporator coil. Clean coils (See Routine
Maintenance) Environmental phenomena: point
supply louvers upward. Put on high fan.
Install gasket, per Installation manual
Refer to installation manual for proper instal-
lation