Pilot Light Keeps Going Out

Understanding the Problem

If you have an older furnace or water heater with a standing pilot light, having it repeatedly go out is frustrating—and means no heat or hot water. While relighting the pilot is simple, if it won't stay lit, there's an underlying problem. Modern furnaces use electronic ignition and don't have pilot lights, but many older systems still do. Understanding why pilots go out helps determine whether it's a simple fix or needs professional attention.

Common Symptoms

You might be experiencing this problem if you notice:

• Pilot light is out and needs relighting often
• Pilot lights but goes out immediately
• Pilot lights but goes out after releasing the button
• Pilot flame is small or yellow instead of blue
• No heat because pilot won't light burners

Possible Causes

This problem can be caused by several factors, listed from most to least likely:

DIY Troubleshooting Steps

Before calling a professional, try these safe troubleshooting steps:

1. 1

   Locate and clean the thermocouple gently

2. 2

   Check that thermocouple tip is in pilot flame

3. 3

   Check for obvious drafts near furnace

4. 4

   Try relighting pilot following manufacturer instructions

5. 5

   Hold igniter button 30-60 seconds before releasing

Prevention Tips

Help prevent this issue in the future with these maintenance tips:

• Schedule annual furnace maintenance
• Consider upgrading to electronic ignition system
• Keep area around furnace clear of debris
• Have thermocouple checked during maintenance