Furnace Pilot Light Keeps Going Out?


Are you frustrated with your furnace pilot light constantly going out? We’ve all been there.

In this article, we’ll explore the common causes of this issue and provide solutions to get your furnace back up and running efficiently.

From a dirty or blocked pilot orifice to faulty thermocouples, we’ll cover it all.

Don’t let a pesky pilot light ruin your comfort – let us help you troubleshoot and fix the problem!

Dirty or Blocked Pilot Orifice

If your furnace’s pilot light keeps going out, it could be due to a dirty or blocked pilot orifice. When we encounter this issue, we first check the pilot orifice for any debris buildup or blockages.

Over time, the orifice can accumulate dirt, dust, and other particles that hinder the flow of gas to keep the flame ignited. To resolve this problem, we turn off the furnace and allow it to cool down completely before proceeding.

Next, we locate the pilot assembly and carefully remove it from its housing. Using a small brush or compressed air, we clean the orifice thoroughly to ensure all obstructions are removed. It is crucial to be gentle during this process to avoid damaging any delicate components within the assembly.

Once cleaned, we reassemble the pilot assembly and relight the furnace’s pilot light. By keeping the pilot orifice clean and unblocked, we enable proper gas flow and ensure a consistent flame that will not go out unexpectedly again in the future.

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Faulty Thermocouple

The most common cause of a faulty thermocouple is a lack of heat. When our furnace pilot light keeps going out, it can be frustrating and uncomfortable. However, after some troubleshooting, we discovered that the issue might lie with a faulty thermocouple.

The thermocouple is a safety device that senses the heat from the pilot flame and sends an electrical signal to keep the gas valve open. If there isn’t enough heat reaching the thermocouple, it won’t generate enough electricity to keep the gas valve open, causing the pilot light to go out.

To fix this problem, we first checked if there was any debris or dirt blocking the pilot flame. Once we made sure that wasn’t the issue, we carefully cleaned around the thermocouple area using a soft brush or compressed air. If cleaning didn’t solve the problem, replacing the faulty thermocouple would be necessary.

It’s important to remember that when dealing with gas appliances, safety should always come first. If you’re unsure about how to handle or troubleshoot your furnace’s thermocouple issue, it’s best to call a professional HVAC technician who can diagnose and repair any furnace problems safely and efficiently.

Gas Supply Issues

One possible cause of gas supply issues could be a clogged or blocked gas line. When we encounter this problem, it can be quite frustrating. We rely on our furnace to provide us with warmth and comfort during the cold winter months, so any disruption in the gas supply can leave us feeling chilly and inconvenienced.

If our gas line becomes clogged or blocked, it can prevent the flow of natural gas to our furnace. This can happen due to various reasons such as debris buildup, corrosion, or even freezing temperatures causing condensation to freeze inside the pipes. Whatever the cause may be, it is important to address this issue promptly.

To resolve a clogged or blocked gas line, we might need professional assistance from a qualified technician who specializes in HVAC systems. They will have the expertise and tools necessary to diagnose and clear any obstructions in our gas line efficiently and safely.

In order to prevent future occurrences of this issue, regular maintenance of our furnace is essential. This includes scheduling annual inspections and cleaning by professionals who can ensure that all components are functioning properly and avoid any potential blockages in our gas line.

Drafts or Airflow Problems

To prevent drafts or airflow problems in your home, ensure that all windows and doors are properly sealed.

When we discovered that our furnace pilot light kept going out, we realized that drafts might be the culprit. We decided to take a proactive approach and check all the windows and doors in our house for any signs of poor sealing.

We started by inspecting the weatherstripping around each window and door, looking for any cracks or gaps that could allow cold air to seep in. We also checked for any loose hinges or faulty latches that could cause improper closure. In some cases, we found worn-out weatherstripping that needed to be replaced, while others required simple adjustments to ensure a tight seal.

We also paid attention to other areas where drafts could occur, such as electrical outlets and vents. Using foam gaskets, we sealed around these openings to minimize airflow problems. Additionally, we made sure that our attic access hatch was properly insulated to prevent heat loss through the ceiling.

By taking these measures, we were able to significantly reduce the drafts in our home and keep our furnace pilot light from going out. Not only did this result in better heating efficiency but it also helped us save on energy costs.

It is essential to regularly check for draft issues and address them promptly to maintain a comfortable living environment and prevent potential damage caused by cold air infiltration.

Faulty Pilot Light Igniter

Here are three possible causes of a faulty pilot light igniter:

  • Dirty or corroded components: Over time, debris can accumulate on the igniter or other parts of the system, preventing it from functioning properly.
  • Misaligned sensor: If the sensor that detects whether the pilot light is lit becomes misaligned, it may not register when it’s actually on.
  • Damaged wiring: Faulty wiring connections or frayed wires can disrupt the electrical current needed to ignite the gas.

Calling a professional is definitely worth it. We’ll replace your faulty pilot light igniter and ensure all other components are working correctly.

Furnace Pilot Light Keeps Going Out – FAQ

(647) 972-8714

How do I clean a dirty or blocked pilot orifice?

To clean a dirty or blocked pilot orifice, we need to turn off the gas supply and let the furnace cool down.

Then, using a small brush or compressed air, gently clean the orifice to remove any debris or buildup.

It’s important to be cautious and avoid damaging the delicate parts. Once cleaned, we can carefully relight the pilot light and monitor it for any issues.

Regular maintenance is key to preventing further problems with the pilot light.

How can I tell if my thermocouple is faulty and needs to be replaced?

To determine if the thermocouple is faulty and needs replacement, we can follow a few steps.

– First, ensure that the pilot flame is hitting the thermocouple properly. If not, adjust it accordingly.
– Next, use a multimeter to measure the voltage output of the thermocouple while holding down the pilot valve.
– If there is no voltage or an inconsistent reading, it may be time to replace the thermocouple.

What should I do if I suspect there is a problem with my gas supply?

If we suspect there’s a problem with our gas supply, the first thing we should do is check other gas appliances in our home to see if they’re functioning properly.

If they’re also experiencing issues, it may indicate a problem with the gas supply itself. In this case, we should contact our gas provider immediately to report the issue and seek their assistance in resolving the problem.

How can I identify and fix drafts or airflow problems that may be affecting my furnace pilot light?

To identify and fix drafts or airflow problems affecting our furnace pilot light, we should start by inspecting the area around the furnace for any noticeable drafts.

Check windows, doors, and vents for leaks or gaps that could be causing air to flow in. Seal these areas with weatherstripping or caulking.

Additionally, clean or replace dirty air filters as they can restrict airflow. If the issue persists, it’s best to consult a professional technician to ensure proper diagnosis and repair.

How do I determine if my pilot light igniter is faulty and needs to be repaired or replaced?

To determine if the pilot light igniter is faulty and needs repair or replacement, we can follow a few steps.

– Firstly, ensure that the gas valve is turned on and there is an adequate supply of gas.
– Next, visually inspect the igniter for any signs of damage or wear.
– If there are no visible issues, use a multimeter to test for continuity in the igniter’s electrical circuit.

If it fails these tests, it likely needs repair or replacement by a professional technician.


So, if you find that your furnace pilot light keeps going out, there are a few potential causes to consider.

  • It could be due to a dirty or blocked pilot orifice.
  • Another possibility is a faulty thermocouple.
  • Gas supply issues could also be the culprit.
  • Drafts or airflow problems may cause the pilot light to go out.
  • Lastly, a faulty pilot light igniter could be the problem.

By identifying and addressing the root cause of the problem, you can ensure that your furnace operates efficiently and reliably.

Don’t hesitate to call a professional if you’re unsure about how to fix the issue yourself.

Stay Warm With an Efficient Furnace!

Emergency Pilot Light Repair Service in GTA

ALP Heating is committed to providing the finest service possible to important areas. We are delighted to be your go-to cooling and heating business for all of your requirements. Because of our commitment to perfection.

King City
North York

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