If the switch remains open at room temperature

or improper venting

Use a compatible thread sealant and tighten 2-1/2 turns past hand-tight for optimal results

or brittleness when the blow-down valve is opened

Amana-Goodman 20162903 Limit Switch If the switch remains openThe Amana Goodman 20162903 Limit Switch is a critical safety component designed for precise thermal monitoring in high efficiency furnaces and package units. This OEM replacement part is engineered to open the electrical circuit at a fixed 160F temperature rating, preventing hazardous overheating and potential heat exchanger damage. As a CO AUTO limit switch, it features an automatic reset mechanism that restores continuity once the temperature drops