Lennox 56W20 R46105-001 Furnace Limit Switch 120-150°F Auto Reset Violet

The Lennox 56W20 (OEM part number R46105-001) is a genuine OEM high-limit control switch designed for use in Lennox, Armstrong, Ducane, and Concord gas furnaces. This automatic-reset temperature limit switch protects the heat exchanger and furnace components from overheating by cutting power to the burner when temperatures exceed safe operating thresholds.

Key Specifications:

• Actuation (Cut-Out) Temperature: 150°F — shuts off burner on high-temp condition
• Reset (Cut-In) Temperature: 120°F — automatically resets once temperature drops
• Insertion Length: 3.18" OAL (overall length)
• Sleeve Color: Violet — for easy field identification
• Type: STILT-style automatic reset limit switch
• OEM Part Numbers: 56W20, R46105-001, 46105-001, 56W2001, R46105001, 46105001, L150-30F

Compatible Lennox / Armstrong / Ducane Models Include:

• CG80RB075D12AL-1
• CG80RB075D12AL-2
• CG90CB045D12B-1
• CG90CB067D12B-1
• CG92TB067D12B-1
• CG95TB060D12B-1
• Select Armstrong, Concord, and Ducane gas furnaces

This is a direct OEM replacement limit switch. Proper furnace limit switch function is critical for safe furnace operation — a faulty limit switch can result in overheating, short cycling, or failure to ignite.