Lennox 87F16 Limit Control 321042-401 or improper seating during a

or improper seating during a burner inspection

While both are float-type controls

preventing soot buildup and protecting the structural integrity of the stainless steel combustion chamber

High-Durability Construction: Built to withstand the constant thermal cycling of a primary furnace limit

Enhanced Modulation: Critical for maintaining the negative pressure reference required for accurate fuel-to-air ratios

Lennox 87F16 Limit Control 321042-401 or improper seating during aThe Lennox 87F16 Limit Control is a critical safety component designed for precise thermal management in residential and commercial heating systems. This 140F limit switch acts as a primary stilt mounted high limit safety, engineered to interrupt the electrical circuit if internal plenum temperatures exceed the 140 degree Fahrenheit threshold. By preventing the heat exchanger from reaching unsafe temperatures due to restricted airflow or blower