Why Does My Water Heater’s Pilot Light Keep Going Out?

A pilot light that keeps going out can be frustrating, especially when you rely on your water heater for daily comfort. If you've found yourself relighting the pilot light on your water heater only to have it go out again, there are a few potential causes. Here’s a guide to help you understand the common reasons behind a failing pilot light, how to fix it, and whether it’s dangerous when it goes out.

1. Dirty or Clogged Pilot Tube

Over time, the pilot tube can collect dirt, dust, and other debris, which can obstruct the flow of gas to the pilot light. When the gas flow is blocked, the pilot light may not stay lit.

• Solution: A plumber can clean the pilot tube to ensure an uninterrupted flow of gas, allowing the pilot light to stay on consistently.

2. Faulty Thermocouple

The thermocouple is a safety device that detects whether the pilot light is lit. If the thermocouple senses that the pilot light has gone out, it shuts off the gas to prevent leaks. However, if the thermocouple is faulty or misaligned, it may mistakenly shut off the gas even if the pilot light is on.

• Solution: A plumber can inspect the thermocouple and adjust or replace it if needed to ensure it’s functioning properly.

3. Drafts or Poor Ventilation

Water heaters are often located in areas like basements or garages, which may be prone to drafts. If a draft blows directly onto the pilot light, it can cause it to go out repeatedly.

• Solution: Identify the source of the draft and reduce airflow around the water heater. In some cases, installing a draft shield can help protect the pilot light.

4. Defective Gas Control Valve

The gas control valve regulates the flow of gas to the pilot light and burner. If this valve is defective, it may intermittently cut off gas to the pilot light, causing it to go out unexpectedly.

• Solution: If the gas control valve is the culprit, it will likely need to be replaced by a professional, as this repair requires specialized skills and tools.

5. Moisture or Water in the Burner Compartment

If water or excessive moisture accumulates in the burner compartment, it can cause the pilot light to go out. Leaks or high humidity can introduce moisture into this area, disrupting the pilot light’s ability to stay lit.

• Solution: Inspect for any signs of water leaks and address them promptly. If you suspect moisture buildup, a plumber can help locate and fix any underlying issues.

6. Low Gas Pressure

If the gas pressure to the water heater is too low, it might not be able to keep the pilot light burning. This could be due to a supply issue with your utility provider or a problem with the gas line itself.

• Solution: Contact your gas company to check for supply issues. If the gas pressure is consistently low, a licensed professional should assess the line for potential issues.
  
  

Is It Dangerous if the Pilot Light Goes Out?

One common concern homeowners have is whether a pilot light going out is dangerous. In most cases, it’s not a direct safety risk because modern water heaters have safety features like thermocouples, which shut off the gas supply if the pilot light goes out. This prevents gas from leaking into your home, reducing the risk of a gas buildup.

However, it can become dangerous if:

• The Thermocouple is Malfunctioning: If the thermocouple isn’t functioning properly, it may not shut off the gas supply when the pilot light goes out, which could allow gas to leak.
  
  
• Repeated Attempts to Light the Pilot Lead to a Gas Buildup: If you attempt to relight the pilot multiple times without success, gas may build up in the area. Always wait a few minutes between relighting attempts and follow the manufacturer’s instructions.

If your pilot light frequently goes out, it’s best to have it checked by a professional plumber to ensure it’s safe to use and functioning correctly. A reliable pilot light is essential for both hot water availability and peace of mind.

When to Call a Professional Plumber

If you’re dealing with a pilot light that won’t stay lit, it’s best to contact a licensed plumber to diagnose the issue. A professional can accurately identify the problem, make necessary adjustments, or replace parts to ensure your water heater works reliably and safely. If you’re in the Treasure Coast area and need help with your water, give us a call. Our plumbers are ready to troubleshoot and resolve your water heater problems so you can enjoy dependable hot water without interruptions.