The spring return fail-safe mechanism ensures the valve moves to a safety position upon power loss

Does this gasket work for all Williams furnace models

reducing the risk of biological growth and standing water

This model replaces the legacy Danfoss 014-0143

With the furnace power off and the part cooled to room temperature

Lennox 33W86 Limit Switch 323613-751 The spring return fail-safe mechanismThe Lennox 33W86 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This SPST (Single Pole Single Throw) control is engineered to monitor heat exchanger temperatures, effectively interrupting the electrical circuit if internal conditions exceed safe operating parameters. Calibrated with a 175F close rating, this switch automatically resets once the temperature drops,