Furnace Making Clicking Noise: What It Means

What Causes Furnace Clicking Sounds?

Clicking sounds from your furnace are usually caused by components expanding or contracting as they heat up.

The most common causes include: the blower motor, heat exchanger, or ignitor. Sometimes it's a loose part or a minor issue like a small metal tab.

Common Causes of Clicking

• Heat exchanger expanding and contracting
• Blower motor or fan assembly
• Ignitor or flame sensor
• Loose or damaged internal part

What You Can Check Yourself

Before calling a pro, you can do a few safe checks to narrow down the issue.

1. 1Turn off the furnace and wait 10 minutes. Listen for any ongoing clicking.
2. 2Check if the furnace filter is dirty or clogged.
3. 3Look for loose panels or parts near the unit.
4. 4Ensure the area around the furnace is clear of debris.

When to Call a Professional

If the clicking is loud, irregular, or accompanied by other warning signs, it's best to call a licensed HVAC technician.

Specific danger signs include: gas smell, burning odor, sparks, or the furnace not igniting at all.

Problems That Require Immediate Attention

• Gas leak or smell of gas
• Visible sparks or smoke
• Burning or electrical smell
• Furnace won’t start or stops mid-cycle

If you notice any of these, shut off the furnace and call a licensed pro immediately.