Lennox Diplomat bangs on shutdown

Old 03-02-11, 04:50 AM
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Lennox Diplomat bangs on shutdown

I have an 18 year old Lennox Diplomat gas furnace. Every year, for a few weeks at the start of the heating season, I often hear a "bang" when the furnace shuts down. Later on in the season, it does not happen. Have heard this for the 12 years we have lived here. Sounds like something being slammed shut. Not sure if it happens at the furnace or in the ductwork.

Any idea what this could be?

Old 03-02-11, 08:43 AM
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The first thing to do is to be a careful observer and determine if the problem is the furnace or the duct work.

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