Might be a slight spin on mine. Mine says there are there but I don't know if they're working.
With help from this forum I learned:
- if you can visually inspect the tanks, you might see a pad and some electrical wires
- if you can't then I've been looking for a voltage drop when I hit the On switch
Since I don't see a drop, it could be
- that my heaters don't work
- or it's not cold enough for their thermocouples to allow them to come on
- or they're 120V based and not 12V
Sorry - that's the best I've got.