You cannot check the T/stats visually,
Check them with your meter for open circuits.
use your meter on the continuity setting,
you want to hear that audiable tone,no tone is a failure.
the T/stats are wired in series,so its possible to bypass them to check that the heating element is getting its supply.
This measure is only a means of troubleshooting the components,and you must shut down the moment you feel any heat.
do NOT USE THE APPLIANCE WITH ANY T/STAT BYPASSED!!!!!!
hope this info helps and good luck with the repair,.
paul, February 2012