Posted by rrc300 u on December 21, 2015 at 16:44:48 from (107.77.76.17):
In Reply to: Lennox pulse furnace posted by Greg K on December 21, 2015 at 16:16:59:
I worked for a Lennox dealer while I was in HVAC school. This was in 1997. What I remember of them things is they had a spark plug and a rubber flapper valve on the qas heat side. From what you describe the heat pump should be working at this outdoor temp. Lennox did have some proprietary electronics on alot of their stuff. I would not be surprised if the heat pump propane change over was one of those proprietary parts. You might look at the basic stuff blocked drain or pressure switch tubes being plugged or blocked. Does the vent motor run or does the spark try to light off. If I remember correctly they pop a few times to get the firing set up and burning. I wish I could be of more help.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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