Kenmore 90 series with speed selector switch set to heavy duty cycle it works fine any other setting , regular , hand wash setting the agitator makes a loud clicking sound as it agitates

hum either a bad timer sticking the point contacts close. have u tried this in all cycles? and possibly a motor with bad windings not enough power to run agitation? try running in mild or gentle and see what happens? I was tempted to say the cam dogs in agitator but they dont work then stop then work, when they go out they go out.

Yours is a 2 speed motor. Does it spin in 2 different speeds. If so, then it most likely is designed with only to agitate in 1 speed. If it only spins in one speed, then your motor is defective

The washer timing control is defective.

THIS IS A TYPICLE PROBLEM . BETWEEN THE MOTOR & THE TRANSMISSION THERE IS A COLLECTOR ASSEMBY (THREE PIECE
SET) REAL EASY TO GET TOO EASY TO FIX . ALSO COST EFFICENT

Since the machine works in two of the three speeds the problem points to either the timer or the switch that sets the speed.

First, see the Sears parts site for your washer:
http://www.searspartsdirect.com/partsdirect/index.action

Enter your model number and you'll see a list of major sub-components with diagrams and parts.

Go to the control panel category and see their diagram and list of switches and parts.

These aren't that difficult to replace but they aren't inexpensive.

There's no delicate or regular spin or agitation If your washer doesn't spin or agitate on either the delicate or regular cycle, check these:

Selector switch
Clutch assembly
Drive motor
Selector switch If your washer has a selector switch on the control panel, make sure the button for your selection is pressed all the way in, or set properly.

Clutch assembly Many GE®/Hotpoint® washers use a clutch and an automatic shift lever. This assembly is quite complicated. If there's a problem with it, you probably should contact a qualified appliance repair technician.

Drive motor Many washing machines have multiple-speed drive motors. Though it's uncommon, the drive motor may work fine on one speed but not on another. If the drive motor has failed on one speed, you need to replace the entire motor.

the OL error is for over load.that is when you over load the clothes in the washing machine. If your washer doesn't spin or agitate on either the delicate or regular cycle, check these:

Selector switch
Clutch assembly
Drive motor
Selector switch If your washer has a selector switch on the control panel, make sure the button for your selection is pressed all the way in, or set properly.

Clutch assembly Many GE®/Hotpoint® washers use a clutch and an automatic shift lever. This assembly is quite complicated. If there's a problem with it, you probably should contact a qualified appliance repair technician.

Drive motor Many washing machines have multiple-speed drive motors. Though it's uncommon, the drive motor may work fine on one speed but not on another. If the drive motor has failed on one speed, you need to replace the entire motor.

bad transmission,,check voltage...below 110 with load and water pressure switch or hose defective..

does you washer have a delicate, or normal speed adjustment switch, if it does make sure its not between setting or it will sound like a machine gun......you may need to replace that switch

THE SPEED SELECTOR SWITCH MAY BE SHORTED CAUSING THE MOTOR TO TRY AND RUN ON BOTH THE LOW AND HIGH SPEED WINDINGS. THIS WILL PULL TOO MUCH CURRENT AND TRIP THE BREAKER.
THE MOTOR WINDINGS FOR THE HIGH SPEED COULD BE SHORTED CAUSING EXCESSIVE CURRENT DRAW.