Our washer and dryer is 18 years old, and is starting to make some funny noises.
I stumbled across a newer set - about a year old - in need of some repair on Craigslist. It is a nice set made by Samsung. The dryer was not blowing hot air. I thought we would take a chance and buy the set and then try to fix it.
I finally had time to play around with it. There's quite a few safety switches and thermostats that are in series that all tested out fine. The last component (the hardest to get to) proved to be the culprit.
This is a centrifugal switch, and it makes sure the dryer motor is spinning before allowing the high current to go to the heater element.
I took it off the motor, and took off the plastic cover, and a little nubbin fell out.
It turns out the missing nubbin is the contact point that makes a solid electrical connection. This nubbin is probably a $0.05 part, but it is attached to $110 motor as an assembly. I broke down and bought the entire assembly just to get this project done and finished.
We now have a nice nearly new washer and dryer. I hope we get many years of good service out of them.