Is cold air coming out of your furnace? Do you hear strange clicks but no warmth? It can be your gas furnace ignitor acting up. It might be a small component of your heat system. But a faulty furnace ignitor can make your winter frightening.

This guide will walk you through how it works, what to look for when it fails, and why calling a pro HVAC technician is the smartest choice.

1. Furnace Ignitors – Keeping Your Home Comfortable

A furnace igniter is like a match for your heating system. Modern furnaces no longer have the pilot light found in older furnaces. They work electronically to light the gas and heat the home. Here’s the breakdown:

  • Each time your thermostat calls for heat, the igniter either creates a small spark or heats up to a glowing hot surface to ignite the gas in your central heating system.
  • Lifespan: According to the DOE, most furnace ignitors can last about seven years. However, the number varies with proper maintenance.
  • Crucial safety feature: The gas valve opens only when there’s an immediate way to ignite the fuel.
  • Igniters function properly by starting a chain reaction:
    • The inducer motor starts.
    • The igniter glows or sparks.
    • The gas ignites.
    • The flame sensor confirms ignition.
    • Warm air is circulated through your vents.

2. Signs of a Faulty Gas Furnace Igniter

When your furnace igniter starts to malfunction, your heating system will warn you. Here are the most common signs you might be dealing with faulty furnace ignitors:

  • NO warm air: It’s the most obvious sign. Your furnace is running, and there’s air coming from the vents. However, it’s cold — a common symptom when your heater is not working properly. The igniter isn’t doing its job to start the flame.
  • Furnace cycles on and off repeatedly: If your furnace shuts off shortly after starting or it tries to ignite multiple times without success, the ignitor could be defective. It happens as a safety response when the system detects a failed ignition.
  • Clicking sounds without ignition: For spark igniters, you might hear a rapid clicking sound as it tries to create a spark, but no flame appears. A hot surface igniter won’t glow orange.
  • Visible damage: If you can safely access the lighter with the power off, you might see cracks on the hot surface igniter’s element.
  • Faint gas smell: This is a rare case. However, it happens if the gas valve opens but the igniter fails to ignite the gas. You must turn off your furnace and contact a professional.

3. Why Do Furnace Ignitors Fail?

  • Age and wear: They simply wear out over time, just like any electrical part.
  • Dirt and debris: Dirt or debris accumulation can insulate the igniter or block the spark, thereby preventing it from doing its job.
  • Electrical issues: Power surges can damage delicate wiring.
  • Faulty flame sensor: A faulty flame sensor can prevent the gas valve from staying open. It leads to the furnace shutting off even if the igniter initially works.
  • Malfunctioning inducer motor: If the igniter motor isn’t working properly, it won’t create the necessary airflow for the ignition reaction to proceed. It won’t provide the small spark needed.

4. What You Can Do – Troubleshooting A Faulty Furnace Ignitor

  • Check the thermostat and power: Make sure that your thermostat setting is correct. The furnace must also have power. Check the electrical breaker box as well.
  • Inspect airflow: A clogged air filter or blocked vent can restrict airflow. It affects furnace performance. Thus, make sure your filter is clean and the vents are clear.
  • Visual inspection: Do it with the power off. Make sure to disconnect the power to the furnace at the breaker. This is a critical part. Then, locate and visually inspect the igniter for any visible damage.
  • Listen and observe, but do it with caution: Once power is restored, try to observe the ignition cycle. Does the surface igniter glow? Does the spark igniter create a spark? If not, then it’s a sign your igniter is malfunctioning.

Important: Working with gas lines and high-voltage electricity can be extremely dangerous.

🚨

MANDATORY PROFESSIONAL SERVICES

✓ Gas line connections or disconnections
✓ Electrical wiring repairs
✓ Any gas odor detection
✓ Carbon monoxide detector activation
✓ Ignitor replacement on units under warranty
CALL 911 if you smell gas – do not attempt repairs

5. Replacing Furnace Igniter – Call a Professional

If the igniter is indeed malfunctioning, replacement is (almost) always the solution. Repair may not resolve the issue. There are two paths to tackle it.

  • Replace it yourself: You should only do it if you have basic electrical knowledge and confidence. You must purchase a new ignitor that matches your furnace model’s specs.
  • Professional replacement: This is the safest and most efficient choice. Why?

6. Cost of Furnace Igniter Replacement

The cost of replacement varies. If you hire a technician in Las Vegas, the overall cost, including labor, will go up. You can schedule reliable heating repair in Las Vegas with local experts who ensure safety, fair pricing, and lasting performance.

7. Maintaining a Healthy Furnace Igniter – Best Defense

Regular maintenance is the best option against unexpected, costly breakdowns. Most igniters require regular upkeep.

  • Yearly inspection of furnace igniter: Schedule yearly check-ups or Central Heating Repair with an HVAC professional from Bob’s Repair to ensure peace of mind all season long. This professional can inspect the furnace igniter, flame sensor, hot surface, gas valve, and other vital parts of your furnace or heat system. Doing so will ensure your furnace functions properly.
  • Clean: Keep the area around the furnace clean. This prevents dirt and debris from accumulating near the furnace igniter.
💡

Worth Mentioning

The sensor plays a vital role. It’s found near the igniter. It’s a crucial safety feature as it detects the presence of a flame. If it’s dirty or faulty, it won’t confirm ignition. As a result, the furnace shuts off even if the igniter works.

🔧

It’s vital to clean this sensor regularly. A certified HVAC technician can do it to prevent many issues with your heating system.

Don’t Let a Malfunctioning Igniter Leave You in the Cold

A faulty furnace igniter is a common issue. It can easily turn your comfortable home in Las Vegas into a chilly one.

You may now understand the symptoms of a malfunctioning furnace igniter. However, it’s always best to consult with a qualified, certified HVAC professional like Bob’s Repair. A pro can safely diagnose and repair your stem to ensure your furnace is running efficiently and reliably.

Not sure what’s wrong with your igniter? Speak with a local HVAC expert.