Pilot Light Keeps Going Out Furnace

Pilot Light Keeps Going Out: Troubleshooting Your Furnace

A flickering or constantly extinguishing pilot light is a frustrating furnace problem, leaving you in the cold and potentially costing you money in wasted energy. This guide will walk you through the common causes of a pilot light that keeps going out and offer solutions to get your furnace back up and running safely and efficiently. Understanding the underlying issues will help you prevent future problems and ensure your home stays warm.

Why is My Furnace Pilot Light Going Out?

There are several reasons why your furnace's pilot light might be extinguishing itself. These issues often intertwine, so it's important to systematically check each one.

1. Insufficient Gas Supply

Problem: The most common culprit is a weak or insufficient gas supply to the pilot light. This can stem from a variety of sources, including low gas pressure in the main line, clogged gas lines, or a faulty gas valve.
Solution: Check your gas meter to ensure it's functioning correctly. Listen carefully near the gas line for any hissing sounds which may indicate a leak. If you suspect a gas leak, immediately evacuate your home and call a qualified gas technician. Do not attempt to repair gas lines yourself.

2. Clogged or Dirty Pilot Assembly

Problem: Dust, debris, or spiderwebs can obstruct the pilot assembly, preventing the pilot light from receiving sufficient gas or air for combustion.
Solution: Carefully inspect the pilot assembly for any obstructions. Use a soft-bristled brush or compressed air (carefully!) to remove any dirt or debris. A clogged pilot orifice can also be cleaned gently with a small wire or toothpick. Always turn off the gas supply before cleaning any part of the gas system.

3. Faulty Thermocouple

Problem: The thermocouple is a small device that senses the pilot flame and sends a signal to the gas valve to keep the gas flowing. If the thermocouple is damaged or dirty, it may not correctly sense the flame, causing the gas valve to shut off.
Solution: Visually inspect the thermocouple for any damage, such as bending or corrosion. If it appears damaged, it needs to be replaced by a qualified technician. Cleaning the thermocouple with fine sandpaper may sometimes resolve issues caused by corrosion.

4. Draft Issues

Problem: A strong draft can blow out the pilot light, particularly if the furnace is located in an area with poor ventilation or strong air currents.
Solution: Check the area around the furnace for any drafts. Adjust vents or add seals to minimize drafts. You might also check for any cracks or openings in the furnace enclosure.

5. Weak Pilot Flame

Problem: A weak or sputtering pilot flame is often a symptom of one of the issues mentioned above, but it can also indicate a problem with the gas pressure regulator or a clogged gas jet.
Solution: Address the potential issues listed above (gas supply, clogged pilot assembly). If the flame remains weak, it's advisable to call a professional for assistance.

6. Faulty Gas Valve

Problem: The gas valve controls the flow of gas to the pilot light and main burner. A faulty gas valve can prevent the pilot from lighting or staying lit.
Solution: A malfunctioning gas valve requires professional replacement. This is a complex repair that should not be attempted by a homeowner without the proper training and tools.

When to Call a Professional

While some minor adjustments can be made by homeowners, it's crucial to understand your limitations. If you're uncomfortable working with gas appliances, always call a qualified HVAC technician. Attempting repairs yourself could lead to gas leaks, explosions, or other dangerous situations. Don't hesitate to seek professional help if:

You suspect a gas leak.
You're unable to identify the problem after checking the common causes.
You're not comfortable working with gas appliances.
The problem persists after attempting basic troubleshooting steps.

Keeping your furnace in optimal condition is essential for your comfort and safety. By understanding the potential causes of a constantly extinguishing pilot light and knowing when to seek professional help, you can ensure your home stays warm and cozy throughout the colder months.