GUARANTEED WORKING TESTED GOOD 100870-03 Furnace control circuit Board
This is a used circuit board. It came out of a working Lennox furnace. It has been tested and is in good working condition. If you have a circuit board that has a 100870-01 part number, this circuit board is its replacement with a better relay built into it. This 100870-03 is the better circuit board. I have four of these circuit boards. You’ll receive one of them. Refer to pictures.