Lennox and their infinate wisdom; putting the flame sensor and high limits in the hardest to reach spots imaginable. Thank the home depot gods for 90' adapters. Being ambidextrous helps too. :
Lennox Hi Boy Oil Furnace With Beckett Burner - appliances - by...
Lennox furnace troubleshooting | HVAC.com
BNR00648 LENNOX 3 Burner Assembly for furnace 25" long / 4" on center (BNR00475) | eBay
DIY - How to Replace Burners on a Lennox G61 Furnace - YouTube
Compatible Lennox PSE-L68 Furnace HVAC Gas Flame Sensor
Help Needed - Lennox Furnace burners dont ignite | DIY Home Improvement Forum
Lennox Furnace burner won't stay on | Page 2 | DIY Home Improvement Forum
Inside of a Lennox Pulse furnace, for those who've never seen one. (the ignitor and flame sensor are accessed through the tiny rectangular panel below the ignition board) : r/HVAC
10 Top Lennox Furnace Error Codes Solved in Greensburg