a functional normally closed switch should show a closed circuit (0 Ohms) when the unit is off

it must be replaced to prevent safety switch lockouts

High Amperage Rating: Supports up to 1

functioning as a primary high-limit safety to prevent heat exchanger damage and hazardous overheating

this gradual switch serves as a rugged

Lennox 40L87 Relay 323269-701 a functional normally closed switchThe Lennox 40L87 Relay is a specialized 24V SPDT switching relay engineered for heavy duty HVAC sequencing and control applications. Designed to handle the rigorous switching demands of Lennox residential and light commercial units, this electrical component facilitates seamless signal routing between thermostats and air handlers or heat pumps. This replacement HVAC relay serves as a direct substitute for numerous legacy control components, ensuring