Masterdragon

I could sure use some help. About a year ago we bought a used Prosun Luxura said to be working. When we went to pick it up they had disassembled it. We loaded it up an got it home. Put it together and nothing!! Could not get sellers to return calls. Anyway, call Prosun and they said it was one of the circuit boards. I sent both to a repair company. Got them back and still nothing. I called prosun again and we tried a couple of things and we got it working but this is what we had to do. Open the canopy and move a small switch on the left side circuit board, then set time on timer, then go back to circuit board and move the switch the other way, then get in the bed and push start. That's what we had to do. And it worked for about a year. Then the wife heard the fans running by themselves when the bed hadn't been used. She unplugged the bed and waited a while then plugged it back in. The word "error" was in the display. I checked what I could then just gave up. Now I am back trying to fix it. Now the word "standby" is in the display but I can't get it to come on. Help!