Goodman Primary Limit Switch 120F (Light Blue Dot)

Goodman / Amana 0130F00038S Primary Limit Switch | 120°F-130°F OEM

The Goodman 0130F00038S (120°F) is a genuine factory-authorized primary limit switch designed for specific Goodman, Amana, and Janitrol gas furnace models. This Original Equipment Manufacturer (OEM) safety device acts as a "thermal watchdog" for your heat exchanger. If the internal temperature hits 120°F, the switch opens to break the electrical circuit to the gas valve, instantly stopping the heating process to prevent damage or fire hazards.

This version is specifically calibrated for systems requiring a lower temperature threshold for safety. It is an auto-reset style switch, meaning it will snap back to the closed position once the furnace has cooled down to a safe operating level.

Compatibility & Cross-Reference

Because Goodman uses the same base part number for different temperature calibrations, it is vital to match the L120 or 120F stamping on your original part.

• Part Number: 0130F00038S / 0130F00038
• Direct Replacement: Replaces older 120-degree switches in specific GMS8, GDS8, and GME8 80% AFUE furnace configurations.
• Verification: Always verify your Model and Serial Number from the rating plate inside your furnace to ensure 120°F is the correct factory specification for your unit.

Why a 120°F Limit Switch Might Trip

A limit switch opening is often a symptom of an airflow issue rather than a part failure. If your switch is tripping, check for:

• Extremely Dirty Filters: Restricting air movement causes the heat exchanger to get too hot too fast.
• Blocked Return Air: Ensure all grilles and registers are open and unobstructed.
• Failing Blower Motor: If the fan isn't moving enough air across the heat exchanger, the temperature will spike.

Why Choose a Genuine Goodman OEM Switch?

• Safety Compliance: Precision-calibrated at the factory to trip at exactly 120°F, maintaining the specific safety overhead required for your equipment.
• Reliability: OEM parts undergo rigorous testing to ensure they won't "nuisance trip" or fail to open in a true overheat situation.
• Simple Swap: Features the exact mounting bracket and 1/4" terminals for a fast, tool-friendly installation.

Technical Specifications