You are correct. I dug through my old posts to see what was up before my previous post, but could not find "max temp" in my posts during the search. I knew I referred to the Gcode page before, so I found the M143 code there without paying attention to the red because I just knew I had used it before.
It was M302, the Minimum Extrude Temp command I was using before.
viewtopic.php?f=7&t=2669&hilit=Min+extrude