Lennox 52W29 Furnace Flame Sensor (LB-74940A OEM)

Free shipping unlocked!

Free shipping NOT unlocked!

Lennox 52W29 Furnace Flame Sensor Kit (LB-74940A OEM)


A flame sensor is a crucial safety component on your gas heating system. During the ignition cycle, your gas furnace goes through a process where a spark or a hot surface ignitor will actually ignite the gas. As the gas is ignited, the flame sensor creates a current of electricity. The electricity is calculated in micro amps. If the furnace’s control board does not read the proper level of micro amps, the furnace will no longer give the system fuel to avoid an explosion.

Over time, if the flame sensor is not cleaned properly, oxidation or carbon buildup can restrict the flame sensor’s ability to work properly, which can result in a malfunction of the furnace.

  • Use the Lennox 52W29 Furnace Flame Sensor with most series of models  -G40, G43, G50, G51, G60. 
  • Replaces 31L71, 31L7101 & LB-74940A


Breathe easy with the PureFilters Promise

Clean indoor air is essential to our well-being, and Canadians deserve a company that offers products to help them live a healthier life. PureFilters was founded with one mission - to help Canadians enjoy clean and healthy indoor air at an affordable price. 

From quality products to hassle-free returns, to superior customer service - our team at PureFilters is ready to help you with your order. Feel free to contact us via live chat, or email us at support@purefilters.ca if you need help with your order.




Customer Reviews

Based on 5 reviews Write a review