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Our shower was working fine for a couple years but started periodically only producing hot water ( single handle american standard /am 11. cartridge ) but no cold. All other fixtures in bathroom still have cold water. I replaced the cartridge but still have the same issue. As a side note, the hot water comes into the valve body on the right side (not left as is usual). It has always been like this.

  • Hello, and welcome to Home Improvement. It's hard to understand what you're asking; would you edit your title/question to make it clearer? – Daniel Griscom Jan 13 at 0:22
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Possibly whoever originally installed the shower valve realized that the hot and cold supplies were switched and they installed the cartridge in the valve in the opposite orientation than normal. This made the control work in the usual way. When you replaced the cartridge you installed it in the correct orientation for hot on the left and so it no longer longer works

  • Am 11 is not reversible. – Sean Jan 13 at 3:06
  • @Sean, then how would the valve have worked with the hot and cold reversed? Do you still have the cartridge that you took out? Is it possible that the original one was reversible and the new one is not? Or maybe a skilled and experienced plumber knew how to modify the cartridge to make it work with reversed hot and cold? – Jim Stewart Jan 15 at 2:10

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