This is LENNOX 18M3401 Furnace Control Circuit Board SureLight  50M61-120 50M61-120-02  used part. 

These parts were removed by HVAC installer from a fully functioning systems. Old system was replaced with newer one (more energy efficient) and was in good working condition. This part was inspected by professional HVAC installer before listed. 

This part is in very good cosmetic condition.  Please see more details from the images attached.

You will receive same item as pictured, or a very similar one.  

FREE USPS Priority mail delivery guaranteed. 

My handling time is 1 business day only. 

If you want the part to be shipped same day you must pay before noon by Pacific time. Please be informed.

Purchasing used parts you agree with the statement that sometimes hidden defects or malfunctions may occur during installation or continuous use. There is no warranty on used parts. 

But you have 30 days satisfaction guarantee and 30 days FREE returns.

 Most of the parts require specific knowledge and skills to be installed properly. If you don’t have skills or knowledge, you must ask certified HVAC technician to install. I am not liable for any damages or failures as a result of improper installation.