19
RS4100004 Rev. 0
Troubleshooting Information
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit and
discharge capacitor through a 10,000 ohm resistor before attempting to service, unless test procedures require
power to be connected. Ensure all ground wires are connected before certifying unit as repaired and/or
operational.
Symptom
Possible Causes
Corrective Action
Insufficient cooling.
Low refrigerant charge.
Test sealed system for proper
charge. Ensure system is free
of leaks. Repair as required.
Restricted air flow.
Inspect air filter, indoor/
outdoor coil for dirt. Clean as
required. Check fins on coils
for damage. Straighten fins if
bent, attempt other repairs as
necessary. Replace faulty
coil if repairs cannot be
made.
Vent control in exhaust position/
Ensure vent control in closed
vent door stuck open.
position when unit is cooling
(consumer education).
Check vent door for proper
operation. Replace/repair as
required.
Unit undersized for area/room.
Reduce area being cooled or
replace unit with larger
capacity model.
Excessive noise.
Outside coil fan blade or inside coil
Check fan blade/blower wheel
blower wheel loose or improperly aligned.
for proper position. Reposition
if necessary.
Ensure hardware attaching fan
blade/blower wheel to motor
shaft is tight. Tighten if loose,
replace if stripped.
Compressor mounting hardware loose or
Check mounting bolts for
grommets worn.
tightness. Tighten if
necessary.
Inspect grommets for wear.
Replace if necessary.
Free parts, loose screws causing or allowing
Inspect unit for parts that may
excessive vibration.
have worked free, loose/
missing screws, other
problems that may cause
excessive vibration.
Repair as required.
Worn fan motor bearings.
Check bearings for wear/loss
of lubricant. Replace motor if
either condition is found.
