How to Test a Furnace Igniter?

Welcome, fellow home comfort lovers! Today, we’re going to delve into an exciting part of your HVAC system: the furnace igniter.

This little champion sparks up your gas furnace, ensuring your home stays warm and toasty. But what if it goes bad?

This guide will walk you through testing and maintaining your furnace igniter in simple, easy-to-understand steps. So, grab a cup of hot cocoa, and let’s get started.

5 Steps to Check if Furnace Igniter is Bad

Step 1: Safety First

Always prioritize safety. Switch off your furnace at the circuit breaker before starting any tests.

Step 2: Locate the Igniter

Access your furnace panel and look for the hot surface ignitor. It’s often near the gas valve and burner assembly.

Step 3: Inspect for Visible Damage

Check your ignitor for any visible damage. A cracked or broken ignitor is a sure sign of a faulty furnace ignitor.

Step 4: Check the Gas Supply

Is the gas supply to your furnace flowing correctly? If not, a lack of gas could be the issue, not a bad ignitor.

Step 5: Test Using a Multimeter

Use a multimeter to test the ignitor. If it shows no resistance, your furnace has a bad ignitor.

How Do You Test a Spark Igniter With a Multimeter?

To test a spark igniter, connect it to a multimeter. A reading between 40 and 200 ohms generally means the igniter is in good condition.

If it shows no resistance, it’s time to replace the ignitor.

How to Clean a Furnace Igniter?

Cleaning a furnace igniter is simple. Use a soft, clean cloth to gently wipe away any dust.

Avoid harsh cleaners or scrubbing. They may damage this delicate component.

What to Do if Furnace Ignitor Lights but No Flame?

If your ignitor lights, but there’s no flame, check other furnace components. The gas valve, flame sensor, or pressure switch may be at fault.

When in doubt, it’s wise to consult with a furnace repair professional. They can accurately diagnose and fix the issue.


And there you have it, folks! You now have a straightforward guide to testing and maintaining your furnace igniter. Understanding how your furnace works is not only interesting, but it’s also a great way to spot potential issues early.

Remember, some tasks can be done DIY, but don’t hesitate to call in the pros for more complex furnace issues. With proper care and regular checks, you can ensure your home stays warm all winter long. Happy heating!

About Roy Cohen

Roy Cohen has a burning passion for heating, cooling, and ventilation. He aims to help you save money on expensive repairs and bring you the best HVAC products. He has years of experience behind him in HVAC repair and garage maintenance.

You can find Roy at his LinkedIn or his email: [email protected]

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