Most of us are accustomed to the sounds our furnaces make. We barely notice the hum of the blower running or the little pops from the air ducts. These are normal, but what about the noises that get our attention because they aren’t what we’re used to hearing? Sounds that are suddenly loud or increasingly loud over time, or have a different quality than the typical sounds could be a signal that it is time to call a professional for a repair or maintenance. Don’t ignore them. Delaying service could result in loss of service, more expensive repairs or premature replacement.
Here are three furnace noises you should never ignore:
1. Loud scraping sound
A scraping, metal-on-metal sound is likely a problem with the blower wheel. One possibility is that the wheel has come loose and is scraping against the blower casing. If caught early, before there is much damage, your HVAC professional can tighten the wheel. This is a relatively easy and inexpensive fix. Another possibility is that the blower wheel is broken and needs to be replaced. Lastly, the most serious cause would be that the motor mount has broken and the entire blower assembly has dropped so that it is hitting the housing.