Pilot Light Won't Stay Lit When I Release The Knob

Pilot Light Won't Stay Lit After Releasing the Knob: Troubleshooting Guide

Is your pilot light refusing to stay lit after you let go of the knob? This common gas appliance problem can be frustrating, but often has simple solutions. This guide will walk you through troubleshooting and fixing this issue, saving you a potential costly service call. Before you begin, remember safety first! Always turn off the gas supply to your appliance before attempting any repairs.

Understanding the Problem

The pilot light's job is to ignite the main gas burner. When you press the knob, it both supplies gas to the pilot and activates the igniter (either a spark or standing flame). If the pilot goes out when you release the knob, it means the safety mechanism isn't detecting a flame, preventing gas flow to both the pilot and the main burner. This usually points to a problem with the thermocouple, the pilot assembly, or the gas supply.

Troubleshooting Steps:

1. Check the Thermocouple

The thermocouple is a small metal device that senses the pilot flame's heat. It generates a small electrical current when heated, which keeps the gas valve open. If the thermocouple is dirty, damaged, or not positioned correctly, it won't generate enough current, causing the gas to shut off.

Cleaning: Carefully inspect the thermocouple for dirt, debris, or corrosion. Use a wire brush or fine sandpaper to clean it gently. Be cautious not to bend or damage the delicate thermocouple.
Positioning: Ensure the thermocouple is correctly positioned within the pilot flame. It should be fully immersed in the flame for proper heat transfer. A slight adjustment might be all it takes.
Testing (Advanced): If you have a multimeter, you can test the thermocouple's continuity. However, this requires some electrical knowledge and is best left to experienced individuals.

2. Inspect the Pilot Assembly

The pilot assembly includes the pilot tube, orifice, and possibly other components. Obstructions or damage in this area can prevent proper gas flow or flame formation.

Clogged Orifice: A clogged orifice restricts gas flow to the pilot. Use compressed air (carefully!) to clear any obstructions.
Damaged Pilot Tube: Examine the pilot tube for cracks or damage. A damaged tube can prevent a stable flame. Replacing the pilot tube might be necessary.
Bent Pilot Assembly: Ensure the pilot assembly isn't bent or misaligned. This can affect the flame's position and the thermocouple's heating.

3. Examine the Gas Supply

A weak gas supply can prevent the pilot from staying lit. While less common, this is still a possibility.

Check other appliances: Are other gas appliances functioning correctly? If not, there might be a wider gas supply issue requiring professional attention.
Gas Valve: Ensure the main gas valve to the appliance is fully open.

4. Consider the Igniter

While less frequently the culprit, a faulty igniter can be the problem. If your appliance uses a spark igniter, a weak spark might not be enough to light the pilot consistently. If it uses a standing pilot (a small constantly burning flame), it might have simply gone out.

Replace the Igniter: This typically requires replacing the entire igniter assembly and is best left to a professional, but can be attempted if you are comfortable working with gas appliances and follow manufacturer instructions.

When to Call a Professional

If you've tried these troubleshooting steps and the pilot light still won't stay lit, it's time to call a qualified gas appliance technician. Working with gas appliances can be dangerous, and a professional can diagnose and repair more complex issues safely and effectively. Don't risk your safety; always prioritize professional help when necessary. This is particularly crucial if you suspect a gas leak or have experienced multiple failures in the past.

Remember to always prioritize safety when dealing with gas appliances. If you're unsure about any step, it’s best to err on the side of caution and contact a professional.