We had a new shower installed a few months ago, and consistently get a loud whistling sound when we turn the shower temp hotter. The contractor and his plumber have been back twice, (1) flushed out the shower head, and (2) the 2nd time flushed out the hot/cold value. Both times did not fix the whistling. When I inspected the supply lines for the hot and cold to the shower, I found the cold water supply line for the shower comes from the water main before the pressure reducing valve, while the hot water goes through the reducer value and the hot water tank. Therefore, my theory is the cold is coming through at a higher pressure and causing the whistling when we turn the shower temp hotter (since the opening for cold gets smaller). Is this a sound theory? Thank you for the help!
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