First trip with this new BH 3570RS and the darn vac system works great but won't shut off unless I trip the breaker. We slid the door plate up to sweep to it, then slid it down to shut it off and the flap shuts tight but it continues to suck, drawing a hard vacuum. This sucks! No pun intented! I tried shorting out the terminals as it appears that's what the little copper bar does when it's closed and door plate is slide down. No change. Any thoughts?