High-voltage appliances like the Frigidaire FWS445RFS2 use a pair of fuses or breakers; if one of the set is tripped or blown by an electrical fault, the appliance might become only partly functional. You might find the washer is able to turn on and accept instructions but is unable to tumble clothes. Reset the fuse or replace the breaker and try the washing machine again. Call an electrician if the problem occurs repeatedly.
Empty the washing machine and spin the drum by hand; you should feel resistance if the belt is properly attached. The drum spins freely if the belt has snapped or slipped off its runners. Although simple in essence, replacing the drive belt is a delicate task and requires the appliance to be partly disassembled. You might be entitled to free service if the appliance is still under warranty. For the rest of us, new belts are available from one of Frigidaire's authorized parts dealers.
The washing machine's motor automatically cuts out when it begins to overheat to prevent damage to other internal parts and reduce the risk of a fire. Turn off the appliance and give the motor 30 minutes to cool. The washer automatically resets the motor after 30 minutes spent idle. Start a new wash from scratch and observe how the appliance performs. A faulty motor may need to be replaced.
Call a Frigidaire technician and have him perform an inspection of the appliance. A faulty motor is one likely cause of an outage of this type. Factoring in materials, parts and the time of the technician, this type of repair is often costly. Ask for a quote before agreeing to any work.