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Capital Heating, Cooling & Electric Blog

Noises Your Furnace Should Never Make


It’s Valentine’s Day and the sound of romance is in the air! Or at least, you wish it was. Instead of the sound of violins, you’re hearing strange noises in your home that are anything but romantic. You’re hearing screeching, squealing, hissing, and wailing noises coming from your furnace. What could these awful sounds mean?

Just like with people, furnaces emit calls of distress when they’re in trouble. Depending on what type of noise you’re hearing, there could be a number of things wrong with your furnace. One thing is for sure: If your home sounds more like a horror movie than a rom-com, it’s time to call us for repairs to restore your peace and quiet.


Squeals of delight from your valentine are the only squealing noises you should hear in your home. A squealing furnace occurs for the very same reasons you hear it in your car: a belt has worn down and needs to be replaced or tightened. Luckily, this is an easy fix for a professional HVAC technician. 


Nothing kills the mood on Valentine’s Day like the sound of metal grinding on metal. Unfortunately, the severity of this noise usually indicated serious issues. Metal on metal means there are loose parts such as broken bolts that are banging around somewhere in your furnace. The blower fan could be loose and grinding against other metal parts. These issues should be addressed sooner rather than later.


A whistling furnace isn’t nearly the same as a Valentine giving an appreciative whistle at your appearance. When your furnace is whistling, it’s usually because the airflow is impeded. Check the air filter and see if it’s clogged with dirt and debris. If so, replace it or clean it and see if that solves the issue. Also, check to make sure the vents are open. 


A clicking sound usually indicates 3 possible issues, some of which are quite severe and require immediate heating repair in Milwaukee, WI.

1. Electronic ignition system: This will sound similar to the noise a gas burner makes on your stove when it’s trying to ignite. A continuous clicking noise may indicate that the electronic ignition system is failing to create a spark to ignite the gas jets and will need to be replaced.

2. Cracked heat exchanger: If the clicking sound occurs after the blower motor turns off, this could be a serious issue that needs to be addressed immediately. There could be cracks in the heat exchanger which are potentially allowing carbon monoxide gas to leak into your home. Turn the furnace off and call for emergency repairs.

3. Pilot light: If the pilot light isn’t getting gas, it’ll make a clicking sound as it tries to ignite. The gas valve could be stuck and this is another situation that potentially indicates a gas leak.

If a noisy furnace is ruining your Valentine’s Day or any time of the year, give us a call to restore peace and quiet to your home.

Contact Capital Heating, Cooling & Electric for heating repair in Milwaukee, WI. We’ve proudly served homes throughout Wisconsin since 2007.

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