In this episode of Repair and Replace, Vance shows how to replace the flame sensor in a gas furnace. The flame sensor monitors the burner. If no flame is detected after 7 seconds, then the gas is shut off. If the flame sensor fails or is dirty, then the furnace might cycle on and off, and will not function properly.

Buy flame sensors online: http://www.amresupply.com/catalog/Sen...

Learn how a furnace works:    • How a Furnace Works | Repair and Replace  

If your furnace isn't working, then watch our troubleshooting guide:    • Furnace Troubleshooting  Common Prob...  

More furnace repairs:    • Gas Furnaces | Repair and Replace  

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00:00 Intro
00:22 How it Works
00:42 What You'll Need
01:09 Step 1: Disconnect the Furnace
01:30 Step 2: Replace the Flame Sensor
02:10 Step 3: Reconnect the Furnace

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