My water well stopped operating and pressure dropped to near zero. I opened the circuit breaker and removed the cover from the controller. It is a Square "D" 20/40 230v unit. The contacts were open. I manually closed them, and then reset the breakers. The pump operated. At 42#, I went to the breaker box and opened the breakers. The pressure by then had reached 50#. I opened the water supply and dropped the pressure to 40#. The contacts never opened. The pressure held at 40#. Am I safe to assume that replacing the controller will solve the problem, or might there be something else contributing to the controller failure?