I’ve been running it for 5 years now with a few problems BUT, I couldn’t figure those out. It’s happened twice now in the last five start-ups…..The unit goes through “SU” then completely shuts down like I unplugged it. Obviously No codes displayed because the unit is “OFF”. So I hit the “ON” button and it starts back up , “SU” phase starts again, and it runs perfect with no problems. I’m thinking a control board since they can’t diagnose themselves…anyone know ?