Frigidaire oven aborts self cleaning cycles

What would cause a Frigidaire oven to abort a self cleaning cycle? My wife has recently tried several times to use the self cleaning cycle & after about 10 minutes or so it shuts down, no longer says "CLN" in the display, it just reverts back to clock. Normally this takes 3-4 hours & the display says "END" when it is finished. The only thing different between the last time she used it & the current non-function status is that I replaced a thermal sensor down by the oven pilot light that allows the gas valve to open. I didn't change any wiring, it was reassembled as it was prior to that part installation. I took several pictures prior to disassembly for reference. TexasFire