{"id":3519,"date":"2024-02-05T12:08:08","date_gmt":"2024-02-05T17:08:08","guid":{"rendered":"https:\/\/orzechheating.ca\/?p=3519"},"modified":"2024-02-06T08:19:36","modified_gmt":"2024-02-06T13:19:36","slug":"furnace-making-knocking-noise-when-off","status":"publish","type":"post","link":"https:\/\/orzechheating.ca\/blog\/furnace-making-knocking-noise-when-off\/","title":{"rendered":"Furnace Making Knocking Noise When Off? Here\u2019s What To Do"},"content":{"rendered":"

Ever heard those weird knocking sounds from your furnace even when it’s off? Let’s figure out what’s up with that and how to get your heating system running smoothly and safely.<\/p>\n

Possible causes for your furnace making a knocking noise when it\u2019s off include metal duct expansion, loose panels, blower motor issues, duct obstructions, improper installation, and high air pressure. Regular maintenance and professional help are key to resolving these issues and ensuring a quiet and efficient heating system.<\/strong><\/p>\n

To help you best understand how some of these causes can contribute to your furnace making loud noises when off, we\u2019ve broken down the causes, impact and some solutions below.<\/p>\n

1. Metal Duct Expansion and Contraction<\/h2>\n

Have you ever wondered why your furnace ducts make knocking noises even when the heating system is inactive? Metal ducts are prone to expanding and contracting as temperatures fluctuate. When your furnace is turned off, the cooling process may cause the ducts to contract, resulting in audible knocking sounds.<\/p>\n