56 PB
TROUBLESHOOTING
COMPLAINT CAUSE SOLUTION
Fan motor does not run.
Inoperative system button Test button & replace user interface if inoperative
Broken, loose or incorrect wiring Refer to applicable wiring diagram
Open capacitor Test capacitor & replace if inoperative
Fan speed button defective Replace user interface if inoperative
Inoperative fan motor
Test fan motor & replace if inoperative (be sure internal over-
load has had time to reset)
Does not cool or only cools
slightly
Undersized unit Refer to industry standard sizing chart
Indoor ambient thermistor open or
shorted
See diagnostic codes and replace thermistor if needed.
Dirty lter Clean as recommended in Owner’s Manual
Dirty or restricted condenser or evapo-
rator coil
Use pressure wash or biodegradable cleaning agent to clean
Poor air circulation Adjust discharge louvers. Use high fan speed
Fresh air or exhaust air door open Close doors. Instruct customer on use of this feature
Low capacity - undercharge Check for leak & make repair
Compressor not pumping properly
Check amperage draw against nameplate. If not conclusive,
make pressure test
Unit does not run
Fuse blown or circuit tripped
Replace fuse, reset breaker. If repeats, check fuse or breaker
size. Check for shorts in unit wiring & components
Loose or disconnected wiring control
board or other components
Check wiring & connections. Reconnect per wiring diagram
The LCDI power cord has tripped (Reset
button has popped out).
Press and release RESET (Listen for click. Reset button latches
and remains in.) Check that the green LED light is on to resume
operation.
Evaporator coil freezes up
Dirty lter Clean lter (see Routine Maintenance)
Restricted airow
Check for dirty or obstructed coil. Clean coil (refer to routine
Maintenance)
Inoperative thermistor
Check Diagnostic Codes. Check Thermistors and replace as
necessary.
Short of refrigerant De-ice coil & check for leak
Inoperative fan motor Test fan motor & replace if inoperative
Partially restricted capillary tube De-ice coil. Replace capillary tube
Compressor runs continually
& does not cycle off
Excessive heat load
Unit undersized. Test cooling performance & replace with
larger unit if needed. See sizing chart.
Restriction in line
Check for partially iced coil & check temperature split across
coil
Thermistor shorted Replace thermistor or electronic control board
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