Diagnosed Luxaire furnace (22 years old) exhibiting no heat condition with board flashing error code for open high limit switch. Successfully restored function by resetting stuck limit switch, but noted it will likely fail again soon. Inspection revealed severely degraded igniter that remains operational for now. Verified heat exchanger integrity with no cracks or damage found. Recommended replacement of high limit switch and igniter to prevent future no-heat conditions. All other components tested and functioning properly.
