Rapidtech Course – Lennox Cracked Heat Exchanger

In 1990, when I started as a service technician, I had the privilege of working on literally thousands of these Lennox Gas Furnaces. If you are a technician this is a must see video on where these Lennox curved heat exchangers fail.

Remember to always check the following when and if you find a failed heat exchanger on a Lennox furnace or any other furnace with a cracked heat exchanger.

  • Static Duct Pressure
  • Filter size
  • Evaporator coil
  • Number of supplies and returns
  • Gas Pressure
  • Delta T
  • Venting
  • Draft
  • Perform a combustion analysis
  • Check for gas leaks


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