Lennox 71W43 Limit Switch 318973-401 Designed to maintain precise air-fuel

Designed to maintain precise air-fuel ratios

This 100135275 burner kit is the industry standard for maintaining HVAC system reliability in demanding commercial and residential environments

It is primarily found in mobile home furnaces and residential air handlers under the Nordyne

and indoor blower operate in perfect synchronization

Service Convenience: Manual override lever permits system flushing and manual operation without requiring electrical power

Lennox 71W43 Limit Switch 318973-401 Designed to maintain precise air-fuelThe 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