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Re: Piston extends but does not retract?
Have you tested the solenoid using a battery? One of our solenoids did not work correctly out of the box. It is possible that one end is not working correctly. Secondly I would put a multimeter on the leads going to the solenoid and see if they are indeed getting the voltage output that you think the programing is sending. Just take each component individual and see if it is working correctly.
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