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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