Troubleshooting Chart
RS4110001 Rev. 0
18
Problems
Possible Causes
Fan motor will not operate.
No power supplied to unit.
Power supply cord faulty.
Selector switch faulty.
Energy saving switch faulty.
Energy control system faulty.
Wire disconnected or loose.
Capacitor is faulty.
Faulty fan motor windings.
Fan blade will not rotate. Fan blade hitting shroud or blower wheel hitting scroll.
Fan motor operates intermittently.
Cycles on motor protector.
Fan motor operates noisy.
Condenser fan blade or evaporator blower wheel.
Loose blower clamp or set screw.
Worn bearings.
Grommets (if applicable).
Compressor will not run, but the fan motor
runs.
Voltage.
Wiring.
Selector switch.
Temperature Control.
Capacitor. (Discharge capacitor before testing.)
Compressor.
Motor protector (external).
Motor protector (internal).
Electronic Control (if applicable).
Hard Starting.
Compressor cycles on motor protector.
Voltage.
Motor protector (external).
Motor protector (internal).
Fan Motor.
Condenser air flow restriction.
Condenser fins damaged.
Capacitor.
Wiring.
Refrigerant system.
Insufficient cooling.
Low Capacity.
Air filter.
Exhaust door open.
Unit undersized
Excessive noise.
Evaporator Blower wheel.
Condenser fan.
Copper tubing.
Compressor internal noise.
Fan motor.
Excessive water or condensation.
Unit operating under extremely high humidity conditions.
No cooling.
Refrigerant leak.
Unit is cooling but room is not cool.
Amps and watts.
Sealed Refrigeration System.
Wattage decreases slowly until abnormally low.
Undercharged, restricted strainer or plugged restrictor tube.
Wattage decreases immediately.
No Refrigerant.
Compressor defective.
Wattage continuously high.
Overcharged of refrigerant.
Evaporator coil partially frosted.
System low on refrigerant.
Evaporator completely iced.
Low outside temperature.
No Heat. (Heat/Cool models only.)
No Power.
Selector switch position.
Temperature control position.
Fan Motor.
Heating element.
Selector switch.
Temperature control.
Terminals and connectors.
Fan motor will not rotate during a heat cycle.
(Heat/Cool models only.)
Thermostatic drain valve. (Water level control, if applicable.)
