Just when you think you have it fixed…. Been plagued with a persistent yet intermittent E-1 code on my 25 PDVC. It will run fine for 2-4 days then kick and E-1 code. Then it will only work for 2 hours, E-1 code. Then maybe again in a hour or two, maybe not. Then fine for a couple of days then it will kick the E-1 code out again. Then it works fine for 2-3 days, a day, whatever. It burns well and produces nice heat. Here’s what I have done so far…… -I cleaned the venting thoroughly, (brushed from stem to stern and LBT’d too) -cleaned the vacuum switch hole in the ash area -checked all the componants (exhaust fan, Auger Motors U/L, Room fan) and are operational . -will check the vacuum hoses (they certainly look fine but will triple check) -What else can I do/check?? -I know I could short the Vacuum switches for diagnostics but from a safety standpoint I don’t really feel comfortable with doing it if I am going to let the thing run for a while. What’s the best way to remove those darn springs holding the hoses on anyway?? I have 20 pairs of pliers but none of them seem to work. Many thanks and remember Spring is coming!!