Yes water is flowing from the solenoid and the pump only runs when solenoid is open. The pump is a Aquatec cap 8800. Removed the solenoid and installed the pressure switch from the kit. Pump shuts off when the ATO sensor (Avast) activates but water continues to flow from both the waste and output lines.
When I shut off the feed water, the water then drains from the first (Sediment) filter housing through the waste water line. Could a hole/break in one of the tubes or a bad check valve on the RO membrane housing be the cause?