Pilot Light Problems? How to Know When to Relight or Replace It

A properly functioning pilot light is essential for your gas water heater to operate efficiently. When the pilot light goes out, it can lead to a lack of hot water, unexpected shutdowns, and frustration. While relighting the pilot is sometimes a simple fix, repeated issues may signal a larger problem that requires professional repair or replacement. In this guide, we’ll explore why pilot lights go out, when to relight them, and when a full replacement is needed.

Why Does the Pilot Light Keep Going Out?

The pilot light is a small flame that stays lit to ignite the burner when hot water is needed. If it keeps going out, there could be an underlying issue preventing it from staying lit. Here are the most common reasons:

1. Faulty or Dirty Thermocouple

The thermocouple is a safety device that detects whether the pilot light is burning. If the pilot light goes out, the thermocouple shuts off the gas supply to prevent leaks. However, if the thermocouple is dirty, misaligned, or malfunctioning, it may mistakenly shut off the gas supply even when the pilot light is on.
🔹 Solution: The thermocouple may need to be cleaned, adjusted, or replaced by a professional.

2. Gas Supply Issues

A disrupted gas supply can cause the pilot light to go out. This may be due to a gas line issue, a problem with the gas control valve, or even low gas pressure from your utility provider.
🔹 Solution: Ensure the gas supply is turned on and functioning correctly. If your other gas appliances are working fine, the issue may be isolated to your water heater.

3. Drafts or Ventilation Problems

If your water heater is located in a drafty area (such as a basement or garage), sudden air movements can blow out the pilot light. Inadequate ventilation can also cause problems by restricting the oxygen supply needed for combustion.
🔹 Solution: Ensure your water heater is in a location with stable airflow and check for nearby open windows or doors that may be causing drafts.

4. Clogged Pilot Orifice

The pilot orifice is a small opening where gas flows to ignite the flame. Over time, dust, dirt, and debris can clog the orifice, leading to a weak or flickering pilot flame that eventually goes out.
🔹 Solution: Cleaning the pilot orifice with compressed air or a fine wire can help restore proper function.

5. Faulty Gas Control Valve

If your gas control valve is malfunctioning, it may fail to supply a steady flow of gas to the pilot light, causing it to extinguish frequently.
🔹 Solution: If the gas control valve is faulty, replacement is the best option to restore consistent performance.

When to Relight Your Pilot Light

If your pilot light has gone out, relighting it may be a simple fix. However, before attempting to relight the pilot, always check for a gas smell. If you detect gas, do not attempt to relight the pilot. Instead, turn off the gas supply and call a professional immediately.

How to Safely Relight a Pilot Light

1. Turn off the gas supply – Locate the gas control knob and turn it to the OFF position. Wait 5-10 minutes to allow any residual gas to disperse.
2. Find the pilot light – Locate the pilot assembly, typically near the bottom of the water heater.
3. Turn the control knob to "Pilot" – Hold it down to allow gas to flow to the pilot.
4. Ignite the pilot – Use a long lighter or built-in igniter to light the flame while holding the control knob.
5. Hold for 30-60 seconds – Keep the knob pressed to allow the thermocouple to heat up and signal the gas valve to remain open.
6. Turn the control knob to "On" – Once the flame is stable, turn the knob to the ON position.

Note: If the pilot light won’t stay lit after multiple attempts, do not force it—this is a sign that a deeper issue is present.

When to Replace the Pilot Assembly

If your pilot light repeatedly goes out despite proper relighting, the problem might be within the pilot assembly itself. Here are a few indicators that your pilot assembly needs replacement:

• Pilot flame is weak or flickering even when gas supply is steady.
• Repeated failure to stay lit, even after cleaning the orifice and thermocouple.
• Corrosion or visible wear on the pilot assembly components.
• Burner fails to ignite, leading to cold water issues.

In these cases, replacing the pilot assembly is often the best solution. A professional plumber can inspect the system and install a new assembly, ensuring your water heater operates safely and reliably.

Preventative Maintenance for Pilot Light Health

To keep your water heater running smoothly, consider these preventative maintenance tips:

• ✅ Annual Inspection: Have a professional inspect your water heater annually to check for signs of wear.
• ✅ Clean the Pilot Orifice: Remove dust and debris buildup to maintain a steady flame.
• ✅ Check Ventilation: Make sure the area around your water heater is free of obstructions.
• ✅ Test the Thermocouple: If you experience pilot light issues, test the thermocouple’s voltage to ensure it's functioning correctly.
• ✅ Monitor Gas Pressure: If other gas appliances in your home are also experiencing problems, your gas supply may need professional attention.

When to Call a Professional

While relighting a pilot light can often be a DIY fix, recurring pilot light issues should always be inspected by a professional. If your pilot light won’t stay lit, or if you’re experiencing other problems with your water heater, Nearby Plumbing is here to help!

📞 Contact Nearby Plumbing at 385-308-5384 for expert water heater repairs in Midvale & West Jordan, Utah. We provide fast, affordable service to get your hot water running again safely!

🚿 Don’t suffer through cold showers—let us handle your pilot light repairs today! 🚿