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For the first time in 2 years I am having the same problem. The water pump cannot prime or hold its pressure. You mention a "three way valve was not seating properly" which was causing an air air leak. Where is this three way valve? I have spent the past 2 days exploring the plumbing behind the control panel and looking for leaks all around the water pump. I see the air bubbles in the water lines. FYI - I have had no problem with winterizing my unit. That check valve is fine. Curious where the 3-way valve is in this maze of plumbing.
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