I have a LP furnace that a local plumber provided. He said it workled when it was removed. I have installed it in my garage, but cannot get it to run. The plumber came and checked it out and said he suspected that it needed a new control board. He grought me another furnace but it is much larger and I already had the intake and exhaust pipes run, so they will not work for the replacement. I jumpersed the R and W terminals, the combustion blower runs, and somethine the pilot ignites intermitantly and will light the burner, but it pulses rapidly. So I am wondering if it is a flame sening switch problem or a gas valave problem. The furnace fan also does not run, but I suspect it may once this problem is resolved?