I just replaced all of the cracked components from the great Texas freeze this year. The last piece was the water pump. I had to replace the main water filter and the small water filter that is attached to the pump itself, along with the plastic valve behind the shower handles. There were no leaks afterward but the pump did just what you are describing. After researching online, I found out that there were valves inside the pump that had frozen and were the problem. I ordered a new pump and installed it. No more 2-second pump runs! All is like new again. On a side note...Who at Thor thought that putting the electrical works right next to the water pump and filter was a good idea? It took a week to dry out the compartment before I could repair it.
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