note.....
when checking the heater on a frigidaire d/w be aware that the heater is not on through the whole dry cycle, it alternates on/off through the dry cycle
so you have to slowly advance the timer through dry, you will see the current draw on the meter start and stop through the dry cycle
this is normal
if you dont have a meter you can simply advance the timer slowly through the dry cycle, then open the door and touch the element with a wet finger, it should be hot to the touch
if your heater is not working first test the heater for continuity, next you test the thermostat(its located under the tub, the back left corner)
also make sure you have a cap on your jet dry dispenser, if the cap gets lost, the dispenser fills with water and the rinse aid is useless