Water Heater Pilot Light Won’t Stay On? Fix It Fast

If the flame doesn’t stay on when lighting your water heater, check for gas supply issues, a faulty thermocouple, or dirty burners that need cleaning.

Is your water heater’s pilot light refusing to stay lit? This common issue leaves you without hot water for showers, dishes, and laundry. Understanding why it happens and how to fix it can save you time and money.

Flame goes out when trying to light water heater

How to Check If Your Pilot Light Is Out

Follow these steps to inspect your water heater’s pilot light:

  1. Locate the front cover panel on your water heater
  2. Carefully remove the panel to view the burner assembly
  3. Look for a small flame near the gas control valve
  4. Check the flame color – it should be blue with a small yellow tip

If you don’t see a flame, your pilot light is out. A yellow or orange flame indicates potential problems with combustion.

Pilot light flame won't stay on water heater

7 Reasons Your Pilot Light Won’t Stay Lit

1. Faulty Thermocouple

The thermocouple is a safety device that detects the pilot flame. When working properly, it keeps the gas valve open. Common thermocouple issues include:

  • Dirt or corrosion buildup
  • Improper positioning away from flame
  • Wear and tear over time

Replacement thermocouples cost $20-$50 and are available at most hardware stores. For proper installation, consider our guide on essential HVAC tools that professionals use.

2. Insufficient Combustion Air

Your water heater needs adequate airflow to maintain the pilot light. Check for:

Problem Solution
Cluttered area around heater Clear at least 18 inches around unit
Blocked vents Ensure proper ventilation
Drafty location Relocate heater if possible
READ MORE  Water Heater Fuse Box: Troubleshooting & Fixes

3. Low Gas Pressure

Inadequate gas supply can cause pilot light failure. Symptoms include:

  • Weak flame that flickers or dies
  • Other gas appliances not working properly
  • Hissing sound near gas lines

Contact your gas utility company if you suspect low pressure. Never attempt to adjust gas lines yourself.

4. Faulty Ignition System

Modern water heaters use electronic ignition instead of standing pilot lights. Problems can include:

  • Worn out igniter
  • Electrical issues
  • Control board failures

According to Constellation Energy, ignition system repairs typically cost $150-$400.

5. Gas Buildup in Lines

Trapped gas can prevent proper ignition. This dangerous situation requires professional attention immediately.

6. Clogged Pilot Tube

Dirt, dust, or insects can block the small tube feeding gas to the pilot light. Cleaning requires:

  1. Turning off gas supply
  2. Disassembling pilot assembly
  3. Using compressed air to clear debris

7. Malfunctioning Gas Control Valve

The valve regulates gas flow to both pilot and main burner. When it fails, you may experience:

  • Intermittent flame
  • Gas leaks
  • Complete failure to ignite

Valve replacement typically costs $200-$500 and should be done by a licensed technician.

How to Relight Your Water Heater Pilot

Follow these steps to safely relight your pilot:

  1. Turn gas control knob to “Off” and wait 5 minutes
  2. Locate pilot access near burner assembly
  3. Turn knob to “Pilot” and depress while lighting
  4. Hold knob down for 30-60 seconds after ignition
  5. Turn to “On” position and verify main burner operation

For more detailed instructions, check your unit’s manual or our guide on HVAC thermostat settings that affect water heater operation.

READ MORE  Recirculating Systems for Tankless Water Heaters: Complete Guide

When to Call a Professional

Seek professional help if you experience:

  • Gas odors
  • Repeated pilot light failures
  • Yellow or orange flames
  • Soot buildup around burner

As noted by Randazzo HVAC, improper repairs can create dangerous carbon monoxide situations. Annual maintenance helps prevent pilot light issues.

Preventing Future Pilot Light Problems

Keep your water heater running smoothly with these tips:

  • Schedule annual professional maintenance
  • Keep area around heater clean and ventilated
  • Install carbon monoxide detectors nearby
  • Consider upgrading to electronic ignition model

Proper maintenance extends your water heater’s life and ensures reliable hot water when you need it.

Joye
Joye

I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.