Well my conclusion so far with the 805 code by welding up a triple tank holder all Aluminum for a trailer, using the Everlast Amptrol Tig gun set to the Special setting of T4 plus Pedal, I never got the code 805 from low amps to high even when I hit the button before an arc started (OOPS).
It seems that the problem is in the foot pedal setting only so far in my testing and welding jobs and I did try all of my pedals one prototype and the two 250EX and the one that came with the 255EXT all EVERLAST Pedals.
T2 or T4 with pedal I never got the code 805 in AC or DC welding.
Everlast PowerTig 325EXT (Canada)
Everlast Power I Mig 250 (Canada)
Everlast PowerPlasma 80S (Canada)
Everlast PowerCool W300 (Canada)
Everlast PowerMTS 250S Fitted with a 30A Spoolgun(Canada)
Miller Dynasty 400 wireless(Canada)
Millermatic 252 plus 30A Spoolgun(Canada)