Lower element is not working. Most probably the element is burned out, but it could also be the thermostat.
Hardware stores have a special wrench to use to screw out the element. Just reading the voltage will not tell you if the element is working; you would need a meter that can read the amerage going through a wire to determine if the element is actually working.
I think ours may have the same problem, but it will have to wait until I recover from my concussion before I work on it.