I had a similar problem with my 2002 Damon Escaper. The problem was not electrical but the mechanical vacumn lever that switches the vent flaps near the floor. The manfacture or installation caused the lever to be too far back and off centre so it could not be moved by the vacumn slide. After I glued a washer on the frame member to keep the lever slightly forward, the vacumn slide could then move the lever and heat came on to the floor. My description may sound a little cryptic but it should be obvious when you look at the heater control equipment on the floor.
Hope this helps. However there still is not a lot of heat to keep the coach warm on cold snowy drives.
KH
