I have a Nordyne Furnace. Model # M1MB070BW. I'm thinking I may need to replace the Flame Sensor on it. But I cannot locate one on this furnace. We just replace a gas valve on this furnace. It lights up for just a few seconds then the flame goes back out. Can you please give me a idea of where the Flame Sensor would be on this furnace.

Not often the senser needs replaced,but maybe, it should be mounted on the left side of burners close to where flame is.. It has only one (1) wire going to it,, remove and clean real good with very fine sandpaper or steel wool