WebbI suspect the issue could be that it has been damaged and is no longer "flapping" open correctly when there is a burst of high pressure behind it. This is evidenced by some … Webb11 okt. 2024 · Rattling (Inside the House), Clanking or Banging. Like “thwapping,” these sounds could be related to the furnace’s blower assembly or motor, and are likely due to something being either loose or broken. If you hear louder banging sounds when the blower is running, shut the system off until you can get help.

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