When ever we turn on the cold faucet in any room in out house we only get luke warm water. I have heard that a faulty washing machine inlet valve can cause this. are there any ways to test that theory? Also any other suggestions to check? We do live in phx, but we should still be able to get semi cold water. Any help is appreciated
Check the temperature of the main home water supply pipe, and compare it to other pipes in the house. Nothing else will be colder, but the other cold water pipes shouldn't be much warmer.
If you find a presumed cold water pipe that's significantly warmer than the main supply, then you can search for the source of the heat. If, for instance, the washing machine is bridging its cold and hot source, then perhaps your cold water faucets are pulling some hot water through the washing machine.