Lennox 71W43 Limit Switch 323055-751 As long as the controller

As long as the controller is configured for a PT1000 RTD input

reducing system shock and improving thermal efficiency

While designed for internal mounting within OptiView or Latitude panels

stable signal back to the tankless water heater control board

Lennox 71W43 Limit Switch 323055-751 As long as the controllerThe Lennox 71W43 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial furnace assemblies. This OEM Lennox replacement part, also identified as the L140 30F limit control, is engineered to monitor heat exchanger temperatures and interrupt the electrical circuit if internal heat exceeds safe parameters. With a fixed 140F opening temperature and a 110F automatic reset, this switch ensures