My Lennox is saying the primary/secondary limit switch is open. No heat

Primary Secondary Limit Switch Open. Troubleshooting Lennox Furnace Primary/Secondary Limit Switch Open Issues It seemed that the blower was not turning on, so replaced the run cap with new 5MF No heat, Just changed the filter and it was pretty bad.

I've read enough where I think I can figure out if the limit switch is the problem by taking out the wires and bypassing the switch to see if it works and then just get a new limit switch My Lennox is saying the primary/secondary limit switch is open

Lennox G51MP Elite Series my furnace is saying the primary

When I turn the unit on and it calls for heat, I hear a switch clicking on/off somewhere near the control board and the voltage swings at pin 1 and 7 as the switch cycles. I have a Lennox G40UH-36A-070-07 furnace that seems to have a shutdown problem - Primary/Secondary Limit If I reset it, it works for some time (30 min ~ couple of hours) and then goes off

Lennox G51MP Elite Series my furnace is saying the primary. My furnace will run between a few hours to a few days but eventually, it'll stop working According to schematic diagram this should mean that "Primry/Secondary limit switch is open"

I have a primary/secondary limit switch open code flashing on my furnace. Starts to blow (lowest speed) and warms up the rooms I have a Lennox G40UH-36A-070-07 furnace that seems to have a shutdown problem - Primary/Secondary Limit