I believe the helm is the pump on these units . — Sounds like something got stuck in one of the valves , holding it open slightly , or you have a small amount of air in the system . — By turning it lock to lock you probably forced whatever it was out of the valve , or forced the air back to the reservoir of the helm . — It may never be an issue again , but then again , who wants to take that chance ?? — Have it checked out by the professionals would be my suggestion . — Hoss