Water pump not working in Technical Tips and Tricks Posted 9 hours ago · Report reply 10 minutes ago, Twotoes said: The problem was an air bubble in the line. He opened the valves on the outside showerand the air passed out. I have never used this shower or opened those valves so not sure how the air got in. He said that the outside shower valves were the closest to the location of the pump and that is why the inside faucets didn’t let the air bubble out and the outside shower did. That is a new one on me, but as long as it works.😳 I hope it keeps working as the explaination sounds pretty strange.