OEM Goodman Primary Limit Switch for AMES800403AXAA — 20162901

The Goodman 20162901 Primary Limit Switch is a genuine OEM high-limit control for the Amana/Goodman AMES800403AXAA 80% AFUE single-stage gas furnace. Mounted on the heat exchanger partition, this normally-closed thermal switch monitors supply-air temperature and interrupts the burners if the furnace overheats — protecting the heat exchanger from damage caused by restricted airflow, a dirty filter, a failed blower, or closed registers. As an auto-reset limit, it re-closes once temperatures return to normal, but repeated tripping points to an airflow fault that must be corrected.

• Genuine OEM Goodman/Amana part number 20162901
• Direct fit for AMES800403AXAA and compatible AMES80 / GMES80 series furnaces
• Auto-reset, normally-closed disc limit with factory-set open temperature
• Primary overheat protection for the heat exchanger and blower compartment
• Correct trip point and probe length for accurate high-limit sensing

OEM vs. Generic

The OEM version matches the factory trip temperature and probe insertion depth exactly — essential for a safety limit that must open at the certified setpoint. The generic version is a spec-matched equivalent at a lower price. For safety-critical high-limit controls we recommend OEM; both ship new and calibrated.

Installation Difficulty: Easy

Rated Easy (~20 minutes). Turn off gas and power, remove the two mounting screws, transfer the wire leads, and reinstall with the sensing element seated correctly in the airstream. If the new limit still trips, diagnose airflow first — replace the filter, verify blower operation, and check duct static — before assuming a component failure.