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The most usual cause


Posted by HKestenholz Moderator on February 27th, 2007 08:36 AM
In reply to Lennox Furnace making ticking/knocking sound by jocasio on February 27th, 2007 08:21 AM [Go to top of thread]
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The ignition sensor needs cleaning/replacement.

http://www.heatpro.us/service/ignitor.htm

www.heatpro.us energy businessmen's knowledge

Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.

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