> The reviews run about 1/3 negative to 2/3 positive for both. The biggest problem
> seems to be that after a short period of time the wafflers just stop working - seems
> they blow an internal fuse.
The gizmo is called a "thermal fuse" or "thermal cut-out" or "thermal cut-off".
Its purpose is to prevent the appliance from catching fire if something in the
appliance gets "too hot" (where the exact definition of "too hot" depends on
the appliance).
o
http://www.cci-tco.com/Nowadays, with regulatory standards being what they are, almost every appliance
has one of these somewhere. In lots of cases (like battery chargers, box fans, and
such), the thermal fuses last forever because in normal operation, nothing in those
appliances gets at all hot; they only overheat when something within the appliance
has broken.
The situation is a bit tougher in "heating appliances" like coffee makers and waffle
irons. There, the very purpose of the appliance is to get hot. So the appliance
contains a thermostat that automatically switches off the electricity flowing to
the heater when the appliance gets appropriately hot. And it also contains this
"thermal fuse" that's set to a somewhat higher temperature. If something goes
wrong with the normal thermostat and it were to leave the heater running past
the normal operating temperature, eventually the appliance heats up to the point
where the thermal fuse blows. The appliance permanently stops heating but
*DOESN'T* catch fire. That's what happens to *SOME* waffle irons that stop
operating.
But there's one problem, though. Every ordinary heat/cool cycle also degrades the
thermal fuse a little. Depending on the design of the device, after a few tens of
cycles (a lousy design) or a few hundreds or thousands of cycles (for a good design),
the thermal fuse blows anyway, just because it "wore out" (the metal inside it crystallizes
and gets brittle) and not because anything got too hot.
If you're handy, in that second situation, they *CAN* be replaced. Mr. Tesha fixed
my daughter's waffle iron in exactly this way. For now, I'll spare you the boring
details of how to do the repair. Someday, it will blow again and he'll replace it
again -- he's already got a spare fuse waiting. ;). (On the other hand, when the
same thing happened to my quite-old coffee maker, he didn't want to bother
replacing the fuse and we just bought a new machine, although for some strange
reason he hasn't thrown the old coffee maker away yet!)
Also, if you buy a waffle iron with an adjustable thermostat (our free one has
this feature), you can run at a somewhat lower temperature than maximum.
This will cause less wear-and-tear on the thermal fuse than running "at full
throttle".
Tesha