The Load output of my Smart Solar MPPT 75/15 seems to be stuck in "on" -- the jumper is removed, and if I set the load to always off in Victron.Connect, the display shows it as "off" but testing it with a small resistive load (two bulbs in series) shows that the current is still on. Would this indicate an electrical fault in the controller? (I tried resetting the settings to factory default, but still the same result.) Can its switch somehow have become short-circuited? Many thanks for any help!