My chest freezer just died. The thermostat dial seems to move a relay up/down and if I push the small stem that sticks out the end (Ranco type K50) the compressor cycles on. I guess I need a new thermostat. The dial won't move the level the extra 1-2 mm needed to activate the internal relay.
How does the sensing coil actually work? On air pressure? If I were to cut it open, I think it's hollow inside, similar to a furnace thermocouple. I presume the sensor somehow moves one end of the relay but I'd like to understand how the thing works since I'm curious.