Lenox Diplomat Bangs On Shutdown - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 03-01-2011, 06:45 AM   #1
Join Date: Dec 2010
Posts: 15
Rewards Points: 10

Lenox Diplomat bangs on shutdown

I have an 18 year old Lennox Diplomat gas furnace. Early in the heating season I sometimes hear a loud bang when the furnace shuts down. This does not happen later on in the heating season.

This has gone on for the 12 years we have owned the house.

What could be causing the bang?



bw777 is offline   Reply With Quote
Old 03-04-2011, 09:11 PM   #2
Join Date: Feb 2011
Location: Vancouver BC
Posts: 1,794
Rewards Points: 1,104

Have someone turn the furnace on & off while you are beside the furnace. Do it often enough to track down where the sound is coming from. You will most likely find it to be a furnace or duct panel that is banging in & out according to the fan creating air pressure or letting off the air pressure. Once you locate the panel (you will probably be able to see it go in or out) then it's just a question of choosing the mechanical method of stopping it. A brick to put weight on a horizontal section or a wire around a vertical panel with a blocking shim or crimping the edge to put pressure on it.


how is offline   Reply With Quote
The Following User Says Thank You to how For This Useful Post:
bw777 (03-05-2011)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Walls making really loud bangs and pops DuckPerry Building & Construction 2 02-23-2011 10:41 AM
Which diagram to use on Lenox Thermostat wiring setup? Heat Pump Lenox techs needed twilightcall HVAC 1 08-13-2008 11:49 AM
Lenox vs Armstrong, Amana vs Goodman fhammette HVAC 1 11-24-2007 08:39 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1