[jsb5717]

Originally Posted by MandK

Yeah, not sure if it’s the limit switch. My limit switch is in series with the sail switch, if that circuit was interrupted it would not light at all. It would shut down earlier in the sequence of events.

But you can easily test it by the ohm test Chuck suggested or by jumping the 2 blue wires connected to it, essentially bypassing it and keeping the circuit closed. If the furnace runs normally then you can be pretty sure it’s a faulty limit switch. If not, then move on to a different component.

Don’t continue to run the furnace with the limit switch bypassed, though. If faulty, replace immediately.