Does it heat at the begining of a cycle if the unit has set for a wial? Do you know if it was taking longer than normal to dry the clothes before this happend?
You are going to have a bad coil on the valve. It is the one with 3-wires going to it. Use part#279834 call your local parts store they should have it in stock. Replace both of them in the kit.
Parts and photo click here
Unplug the unit and remove the screws that hold the door hinge and the two on the other side. lift the door off. With your thumbs on the inside where the door was twist out and remove the front panel. Two screws on top of the valve and remove the coil clamp. Replace the coils and you are good.