S1-7680-3591 Coleman limit switch L155-20F
S1-7680-3591 Coleman limit switch L155-20F
The S1‑7680‑3591 is a genuine OEM L155‑20F automatic reset limit switch designed for Coleman, York, Luxaire, Fraser‑Johnston, and Evcon furnace applications. This temperature‑sensitive safety control protects the furnace from overheating by opening the control circuit when temperatures reach 155°F and automatically resetting after the temperature falls approximately 20°F.
Installed in the furnace heat compartment, the S1‑7680‑3591 helps prevent damage to the heat exchanger, blower components, wiring, and surrounding furnace parts caused by excessive operating temperatures. Built to original Source 1 specifications, this limit switch ensures proper temperature protection and reliable furnace operation.
Ideal for replacing failed or nuisance‑tripping limit switches while maintaining OEM safety standards.
Cross‑Reference
Direct OEM
- S1‑7680‑3591
- 7680‑3591
- York Source 1 OEM Limit Switch
Compatible Brands
- Coleman
- York
- Luxaire
- Fraser‑Johnston
- Evcon
Specifications
- Temperature Rating: L155‑20F
- Open Temperature: 155°F
- Differential: 20°F
- Reset Type: Automatic Reset
- Type: High‑Limit Safety Switch
- OEM Replacement: Yes
Related Limit Switches
(Verify temperature ratings before substitution)
- S1‑025‑35380‑000 — L140‑30F
- S1‑025‑22273‑001 — L150‑110F Fork Limit
- 7624A3591 — L180F Upper Limit
- S1‑025‑29041‑007 — L170‑30F
- S1‑025‑31813‑000 — L160‑30F
Technician Notes
- Protects furnace components from excessive temperatures.
- Automatically resets after cooldown.
- Common causes of limit trips include:
- Dirty air filters
- Restricted airflow
- Failing blower motor
- Blocked evaporator coil
- Closed supply registers
- Duct restrictions
Common Symptoms of Failure
- Furnace burner shuts off before satisfying thermostat
- Blower continues running after burner shutdown
- Open limit fault conditions
- Intermittent heating
- Heater overheating shutdowns
Cross Reference
| Equivalent P/N | Manufacturer / Notes |
|---|---|
| 7680-359 | Original Coleman P/N |
| 626440 | Nordyne upper limit switch |
| L155-20F | Universal limit switch designation (60T11 style) |
Technician Notes
-
Always disconnect electrical power at the service panel before servicing the furnace.
-
Access the limit switch through the blower compartment; remove mounting screws and gently pull the switch out of its 60T11 housing.
-
Verify continuity across the L1 and L2 terminals at room temperature and an open circuit when heated above 155 °F.
-
Ensure replacement switch is fully seated in the housing and terminals are snug—loose connections can overheat.
-
After installation, run the furnace through several heat cycles to confirm proper trip and reset operation.
Compatibility
| Application | Models / Series |
|---|---|
| Coleman Gas Furnaces | 7600, 7624, 7654, 7680 series |
| York & Miller Furnaces | Universal 60T11 limit housings |
| Aftermarket Retrofits | Any 60T11-style upper limit switch mount |
| Nordyne / Broan-NuTone | Replacement for part 626440 |
Upper limit switch shuts down gas valve if overheating occurs. L155-20F. Size 60T11.
Replaces 7680-359. Also replaces Nordyne part # 626440.
