Goodman 1370908S Furnace Limit Switch 200°F | L200-40F OEM HVAC Safety Control Switch | 24 Volt

The Goodman 1370908S is a mission-critical genuine OEM safety limit switch designed to serve as the "brain" for thermal protection within your gas furnace. This fixed-temperature disc control monitors the heat exchanger's surface temperature, acting as a primary fail-safe to prevent catastrophic overheating. Specifically engineered for the GMS8, GDS8, and GMP furnace series, this switch is a "Normally Closed" component that opens the 24V safety loop if temperatures exceed 200°F. Utilizing this factory-authorized replacement ensures that your system maintains its UL safety certification and protects the heat exchanger from structural stress caused by restricted airflow.

Key Features

• True OEM Specification: Explicitly manufactured under part number 1370908S to match the original factory calibration for precise 200°F thermal interruption.
• Safety Loop Integrity: Features a "Normally Closed" (NC) circuit design that provides 100% gas valve shutoff in the event of a blower failure or blocked internal filter.
• Rapid Thermal Response: Engineered to fix specific "limit tripping" or "short cycling" issues by providing a reliable 40°F reset differential (L200-40F).
• High-Temp Bimetal Disc: Constructed with a precision bimetal sensing element that resists "welding" or sticking, a common cause of failure in generic aftermarket safety switches.
• Universal Mounting Flange: Designed for an exact fit in Goodman and Amana burner vestibules, ensuring the sensing probe is positioned at the optimal depth for accurate monitoring.

Product Details

• Brand: Goodman-Amana / Janitrol
• Manufacturer: Daikin Comfort Technologies
• Part Number: 1370908S
• UPC: 786710137090
• SKU: 1370908S-OEM
• Shipping Weight: 0.05 lbs
• Voltage: 24 VAC / 120 VAC Compatible
• Open Temperature: 200°F (L200)
• Close/Reset Temperature: 160°F (40°F Differential)
• Contact Type: SPST (Normally Closed)
• Terminals: 1/4" Male Spade Connectors
• Ignition Type: Compatible with HSI and Spark Ignition Systems

🛠️ HVAC Depot Pro Tip

Take a Picture of the Mounting Flange First: Before removing the old switch, photograph its orientation and the wire colors attached to the terminals. If your furnace is tripping this limit, Diagnostic Check your air filter and evaporator coil for dirt buildup before installing the new 1370908S. A limit switch usually fails because it has been forced to "cycle" too many times due to restricted airflow; replacing the switch without fixing the airflow issue will lead to a repeat failure of the new part.

Cross-Reference

• Superseded / Legacy Numbers:

  1370908, B1370908, B13709-08, 0130F00038, 0130F00038S

• Texas Instruments / Klixon Equivalents:

  20500 Series L200-40

• White-Rodgers / Emerson Equivalents:

  3L01-200

• Drawing Numbers:

  B13709 Series Safety Controls

Model Compatibility

• GMS8 (Suffixes: 0403AX, 0603AX, 0804BX, 1005CX, 1205DX)
• GDS8 (Suffixes: 0403AX, 0603AX, 0804BX, 1005CX)
• GMP (Suffixes: 050-3, 075-3, 100-3, 100-4, 125-5)
• GMPN (Suffixes: 040-3, 060-3, 080-4, 100-4)
• GHS8 (Suffixes: 0403AX, 0603AX, 0804BX)
• GMNT (Suffixes: 040-3, 060-3, 080-4, 100-4, 120-5)