4T110F Thermodisc | 110°F Flush Mount Low Limit Fan Switch for Stoves & Pellet Systems

4T110F Thermodisc – 110°F Flush Mount Low Limit Fan Switch for Wood, Pellet & Corn Stoves

Maintain safe and efficient operation of your stove with the 4T110F Thermodisc. This flush-mount, low-limit snap disc switch allows power to flow to your blower only when your stove reaches optimal heating temperature—cutting off power when the stove cools down to prevent cold air circulation. Ideal for wood, pellet, and corn stoves, it also serves as a direct replacement for the discontinued 4T120F.

Key Features:

• Proof of Fire Activation – Ensures the blower only runs when your stove is actively producing heat
• Low Limit Control – Closes at 110°F to start the blower, opens at 90°F to stop the fan
• Flush Mount Design – Compact, secure fit for easy integration
• Versatile Compatibility – Generic control used across multiple stove brands and models
• Replaces OEM Parts – Equivalent to 80P20038-R, NBK 20159, F110-20F, and more

Specifications:

• SKU: 4T110F
• Part Numbers: 80P20038-R, NBK 20159, F110-20F (equivalent)
• Switch Type: Normally open snap disc
• Close Temperature: 110°F
• Open Temperature: 90°F (20°F differential)
• Mounting Style: Flush mount
• Application: Low-limit proof of fire / combustion blower activation switch

Compatible Stove Models:

• Apache
• St. Croix Pellet & Corn Stoves, including:
  • Afton Bay
  • Ashby-MF, Ashby-P
  • Auburn
  • Eclipse
  • Element-MF, Element-P
  • Greenfield
  • Hastings
  • Lancaster
  • Lincoln SCR (Serial #0–300)
  • Lincoln SCS (Serial #301+)
  • Pepin
  • Prescott EX, EXP, EXL
  • Revolution
  • SCF-050
  • York Insert

Fitment Note: This switch is also widely used as a generic control on many other wood and pellet stove systems. Always check your stove’s manual or existing switch part numbers for proper compatibility.

Pairs well with: Apache Parts and  St. Croix Parts

Prevent unnecessary fan operation and keep your stove running efficiently with the 4T110F Thermodisc.