rather than a faulty furnace high limit switch

technicians often cut sampling tubes to size

Extended Reach: Optimized for industrial duct smoke detection in systems spanning 48 to 96 inches

a condenser fan motor that won't spin without a manual push

ensure you check for restricted ductwork or a failing furnace inducer motor that might be causing actual overheat conditions before concluding the switch is defective

Intermatic TN311C Timer rather than a faulty furnaceThe Intermatic TN311C Timer is a high capacity 24 hour mechanical plug in timer engineered for demanding HVACR and industrial indoor applications. Built with a grounded 3 prong receptacle and a NEMA 5 15 plug configuration, this heavy duty timer is rated for 15 Amps resistive and 1750 Watts tungsten, making it a reliable solution for managing window air conditioners, heaters, and high pressure sodium lighting. The unit supports up to 3 ON 3 OFF