I would check all the wiring to start with. make sure all the cords are plugged into the control box nice and tight.
after that it is a matter of diagnostics.
if the pump is coming to to purge the system it sounds to me like one of the relay's on the circuit board may be out in which case you will need either a new circuit board for the control box if the company sells it separately or a new control box to fix your system.
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