I have not worked with the solorain product before, but is it possible that the unit is unscrewed slightly? Forgive my ignorance with this product, but irritrol DC selonoids have magnets that actually hold the plunger up while the valve is in operation. Is it possible this product works the same? I know a tap on the top or side of the irritrol or toro dc selonoid is usually enough to break the magnetism between selonoid and plunger, thus turning off the valve. Again, I don't know if the solorain operates in the same fashion.