Lennox 87F16 Limit Control 321894-708 or visible warping of the

or visible warping of the burner head

This Trane OEM replacement part is critical for restoring system airflow and maintaining the static pressure required for optimal heat exchange

the 99K57 draft inducer is essential for clearing the heat exchanger of combustion gases and proving the pressure switch circuit to initiate the ignition sequence

Is it suitable for pilot-only flow

A non-lockout module like the 780-705 will continue the spark and pilot gas flow as long as there is a call for heat

Lennox 87F16 Limit Control 321894-708 or visible warping of theThe 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