Hi, my name is XXXXX XXXXX I have been in the home improvement and repair field for 20 years. I will be glad to help you today. i would suspect the same. Have you checked the inlet filter? If the inlet filter is clear then here is a video that will help you diagnose and replace the solenoid. http://www.youtube.com/watch?v=NzJjzWqxesc If you have any questions certainly let me know. I am here to help you.