American Standard Furnace Blinking Red Light. Sometimes these codes are displayed on the furnace, or you may have to find your furnace manual. Our comprehensive american standard furnace error code guide will explain common issues, provide tips, and show you how to read your model's error codes.

A slow, steady light generally means that the unit is on but not providing heat, while a fast, steady blinking light means the unit is working properly and providing heat. I have an american standard freedom 80 comfort r furnace. You see, this light isn't a miracle worker.