I tried to "clean" the sensor with some wire and when I refilled the orb the light didn't come on.
Going to try to suction out the excess and see if the light comes back on -- the sensor being dirty and not completely broken would explain it being intermittent at first and constant now. Also try the continuity with both variables. I hadn't thought to check it that way.
Just knowing that the problem is in the orb sensor and not the overall temperature is good news. I was always fearful that the temp gauge was misreading -- which is why we replaced all the other sensors when we were doing other work.
