Where is the high limit switch on my luxaire furnace so I can reset it. As soon as it calls for heat the led light flashes red four times and the code is limit switch open. Everything starts up the ventor motor and the blower but there is no flame.
I need heat

There is probably more than one limit switch on the furnace. The primary limit switch is usually near the center of the main cell panel, and is typically auto-resetting. If it is stuck open, tapping the plate between the terminals may cause it to reset, but an underlying overheating condition likely exists (clogged air filter, etc.). See pic 1.

An auxiliary or roll-out limit switch is typically the manual reset type. See other pics.

Thank you i will give this a try and i hope it works.