I try this scheme, but not workingA temperature probe on the cold side can detect a fan failure. (I suppose it can be on either side, but the ones I have seen are usually on the cold side.) If the hot side of the peltier is not cooled by the fan, the cool side of the peltier will not stay cool. Then you would operate a thermostatic switch to turn off the peltier if it's hot.
by Luke James
by Steve Arar
by Steve Arar