Armstrong Furnace R40154B004 Limit Switch suitable for most forced air

suitable for most forced air furnace and rooftop unit HSI systems

Common symptoms include the indoor blower running constantly or the burner failing to ignite (tripped safety)

High Electrical Rating: Features a 15-amp non-inductive rating at 277Vac

Key Benefits Advanced HH Core: Incorporates activated charcoal to remove wax

Armstrong Furnace R40154B004 Limit Switch suitable for most forced airThe Armstrong Furnace R40154B004 Limit Switch is a critical safety component designed for precise thermal regulation within residential heating systems. Engineering for reliability, this L170F 30 limit control features a factory set 140 170F temperature range, ensuring the burner circuit interrupts if internal temperatures exceed safe operational parameters. As an authentic OEM Armstrong replacement part, it provides high limit protection for Allied