A furnace pressure switch is a small but critical safety component that ensures your heating system has proper airflow before ignition. When it malfunctions, it can trigger error codes, prevent the furnace from starting, or cause frequent shutdowns, leaving homeowners frustrated and uncomfortable during colder months. Understanding the causes behind pressure switch problems, from blocked vent pipes and airflow restrictions to faulty wiring and switch failures, can help you diagnose issues quickly. This guide explains common furnace pressure switch error codes, airflow-related problems, and repair solutions to keep your heating system running safely and efficiently. Table of Contents:What Does a Furnace Pressure Switch Do?Furnace Pressure Switch Error Codes Problems and What They MeanCommon Causes of Furnace Pressure Switch Airflow IssuesStep-By-Step Process To Fix Furnace Pressure Switch Airflow And Error Code Issues What Does a Furnace Pressure Switch Do? A furnace pressure switch is a...