I have a 6 year old Lennox G40 furnace that I've replaced the flame sensor twice and the ignition switch (part 141153) once. I'm going to place a service call in the morning, but it appears the ignition switch is going out again. Does anyone know if this is a known issue with this Lennox model or if this model prone is to issues? I've never had so many issues with a Lennox furnace/AC in the past as I have since our house was built 6 years ago. Any info on this model would be appreciated.