I work in service and bought 3 thermocouples. They fit Quadra-Fire 1100I, 800, 1000, 1200 and 1200I. We first put one at 1200, he didn't register. So I swapped the wires and found that when I reassembled the red and yellow coatings were reversed. These wire connections respect polarity and the device will work. The thermocouple consists of two different metals. So try changing the cables if that doesn't work before sending it back.
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