Why is Your Furnace Making A Clicking Noise?

In most cases, the furnace’s spark igniter is generating a clicking noise when trying to light the pilot light/burners. It’s possible that the system isn’t working properly if it keeps clicking. However, this can be especially problematic during the chilly winter months when one cannot heat their homes.

This is a situation one should NOT attempt to resolve on their own. If you have this problem, you’ll need an HVAC specialist for a furnace tune-up in Mill Creek, WA to have your furnace diagnosed and repaired. Continue reading if you’re curious about the clicking and want to learn more about the issue.

Let’s start with the basics:

Ignition System – What is it?

Like your car’s ignition system, your furnace’s ignition system operates in the same way. The car or the furnace is started by the ignition. You can’t start your heater or car if your ignition system isn’t working properly.

Let’s have a look at the procedure of starting your furnace. This will help you understand how your furnace’s ignition system works.

  • Your thermostat detects a dip in temperature below your set point.
  • When the fan motor is activated, it pulls air into the burner.
  • For the ignition system, it takes around a minute to get started.
  • As a result, the gas valves open.
  • The furnace’s burners have been ignited.
  • After a brief delay, the blower restarts to spread the heated air throughout your home.

The furnace fails during the step involving the activation of the ignition system, resulting in the ‘clicking’ noise you may be hearing. The clicking noise is caused by the spark igniter constantly attempting to light the gas and burners.

Why Does Your Furnace Click?

  • Thermocouple: As a flame sensor, a thermocouple opens the valves to release gas when it detects a fire. If the flame sensor fails to detect the spark igniter, the valves will not open, and the gas will not pass through.
  • Problems with the pilot light/flame: The pilot flame may not be reaching the flame sensor because of an improper gas-air mixture. This can cause clicking sounds.
  • The gas valve isn’t activated: There is no heat if there is no gas. When the gas valve is closed, the igniter has nothing to ignite; thus, it continues to click.

Sounds You Shouldn’t Ignore

You may have heard clicking or cracking noises. They can suggest potential furnace problems, but they could also be nothing at all. There are, however, some additional sounds that you should pay attention to, like buzzing (a sign of excessive vibration), squealing (a problem with the belt or fan motor), and whistling or rattling sounds (broken fan or motor parts).

An HVAC technician should address all of the issues listed above. In case of any unusual sounds coming from your furnace, consider a furnace repair in Lynnwood, WA. For professional HVAC services, get in touch with DVAC Heating & Air LLC today!

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