makolber wrote, on Tue, 23 Dec 2014 16:08:42 -0800:

the flame sensor has only 1 connection

I don't profess to understand how that flame sensor works,
but, it does, perhaps, seem to have *two* connections.

1. The spade where the white wire goes, and,
https://c4.staticflickr.com/8/7516/1...0760b5ca_c.jpg

2. Ground (where it's bolted to the chassis).
https://c4.staticflickr.com/8/7480/1...7e94f4f8_c.jpg