Quote Originally Posted by GoingPostal View Post
It depends on the type and brand of the thermostat. Some fail on, some fail off, some have alarms, others don't. I have herpstats which are supposed to fail off and you can set high/low temp alarms. Some people do the redundancy route as already covered.
Wow that's pretty cool! Mine are just Zilla and jump start, not sure whether they turn off if not working. I haven't seen any posts here talking about what will happen if something wrong with thermostat, maybe it happens super rare?