The Coleman 7624A3591 Upper Limit Switch is a genuine OEM L180F high‑limit safety control designed for Coleman, York, Evcon, Luxaire, and Fraser‑Johnston furnaces. This automatic‑reset limit switch monitors furnace temperatures and opens the control circuit when temperatures reach 180°F, protecting the heat exchanger and furnace components from overheating.

Once temperatures return to a safe operating range, the switch automatically resets, restoring normal furnace operation. The 7624A3591 is commonly used as an upper plenum limit and is engineered to provide dependable over‑temperature protection while maintaining OEM safety specifications.

This OEM replacement is ideal for correcting nuisance limit trips, open limit faults, and overheating shutdowns caused by a failed or weakened limit switch.

 Cross‑Reference 

Direct OEM

• 7624A3591 — Coleman Upper Limit Switch
• S1‑7624A3591 — Source 1 OEM Number
• 7624A3591A — Alternate OEM Format

Compatible Brands

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

Specifications

• Temperature Rating: L180F
• Open Temperature: 180°F
• Reset Type: Automatic Reset
• Application: Upper Furnace Limit Switch
• OEM Replacement: Yes
• Warranty: 1 Year

Related Limit Switches

(Verify ratings before substitution)

• S1‑025‑31813‑000 — L160‑30F
• S1‑025‑29041‑007 — L170‑30F
• S1‑025‑35380‑000 — L140‑30F
• S1‑025‑35358‑000 — L150F Manual Reset

 Technician Notes

• Protects furnace from excessive operating temperatures.
• Automatically resets after cooling.
• Common causes of limit switch trips:
  • Dirty air filter
  • Restricted ductwork
  • Blower motor failure
  • Blocked evaporator coil
  • Incorrect blower speed
• Always inspect airflow and blower performance before replacing a limit switch.

Common Symptoms of Failure

• Furnace burners shut down prematurely
• Blower continues running after burner shutdown
• Open limit fault codes
• Intermittent heating
• Furnace overheating shutdowns