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What is the banging noise a few seconds before the furnace goes on?

Post created: 2014-02-04 Type of Equipment: Furnace Views: 316

This question was created on the page: https://www.furnacecompare.com/furnaces/lennox/slp98v.html.

On 2014-02-06 Adam wrote:

Usually that is the sound of a cold heat exchanger expanding as heat is applied to it, the ducting design depending on how it was done can actually amplify the noise compared to standing in front of the furnace during operation and this can increase with age of furnace. Your best bet is to find a service company you can trust to take a look. My opinion is if the technician starts showing you all the options for replacing it and their available financing then he probably has a sale qouta to meet

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