Test Heating Element
Lift up on the metal coil or heating element and pull it out of the receptacle block on the range. Examine the terminals of the heating element and see if they are dirty or corroded.
Clean the terminals of the heating element with a wire brush or steel wool. If you do not have a metal brush or steel wool, use sandpaper to clean the terminals.
Wipe any remaining residue off of the terminals with a damp cloth.
Insert the heating element back into the stove. Turn the dial for the burner on and see if the heating element now works correctly.
Verify that all of the terminals on the burners or heating elements are properly connected to the receptacle block on the stove. If a heating element is loose it will not heat properly.
Check the power cord and make sure that it is plugged into the electrical outlet.
Turn the switch to the burner of and then back on the "low" setting. If the burner heats to high when on the low setting the contacts in the switch are bad. You will need to install a new switch to correct the problem.