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If your furnace lights up, runs for a few seconds, then shuts off and tries again, a dirty flame sensor is almost always the reason. The good news: you can fix it yourself in about 15 minutes with a screwdriver and a piece of steel wool. Here's exactly how to do it safely. Table of Contents What Is a Furnace Flame Sensor and Why Does It Get Dirty? Signs Your Flame Sensor Needs Cleaning Tools and Materials You'll Need Step 1: Turn Off Power and Thermostat Safely S