The S1‑025‑38737‑000 is a genuine OEM L160‑20F automatic reset limit switch designed for Coleman, York, Luxaire, Fraser‑Johnston, and Evcon furnace systems. This safety control protects the furnace from overheating by opening the circuit when temperatures reach 160°F and automatically resetting after the temperature drops approximately 20°F.

Built in the industry‑standard 36TX11 style, this limit switch helps safeguard the heat exchanger, blower compartment, wiring, and other critical furnace components from excessive temperatures caused by restricted airflow or system malfunctions.

The S1‑025‑38737‑000 is a direct OEM replacement that restores factory safety protection and reliable furnace operation.

 Cross‑Reference

Direct OEM

• S1‑025‑38737‑000
• 025‑38737‑000
• Coleman / York L160‑20F Limit Switch
• 36TX11 Style Limit Switch

Compatible Brands

• Coleman
• York
• Luxaire
• Fraser‑Johnston
• Evcon

Specifications

• Temperature Rating: L160‑20F
• Open Temperature: 160°F
• Differential: 20°F
• Reset Type: Automatic Reset
• Style: 36TX11
• Function: Opens on temperature rise
• OEM Replacement: Yes

Related Limit Switches

(Verify temperature ratings before substitution)

• S1‑025‑35380‑000 — L140‑30F
• S1‑7680‑3591 — L155‑20F
• S1‑025‑31813‑000 — L160‑30F
• S1‑025‑29041‑007 — L170‑30F
• 7624A3591 — L180F Upper Limit

🛠️ Technician Notes

• Protects the furnace from excessive operating temperatures.
• Automatically resets after cooling.
• Common causes of limit trips include:
  • Dirty air filters
  • Restricted return air
  • Failed blower motor
  • Dirty evaporator coil
  • Closed supply registers
  • Undersized ductwork

Common Symptoms of Failure

• Furnace short cycles
• Burners shut off early
• Blower continues running
• Open limit fault codes
• Reduced heating performance
• Intermittent operation

Installation Tips

• Always match the exact temperature rating.
• Check system airflow before replacing.
• Inspect blower wheel and motor operation.
• Verify proper temperature rise after installation.