My his and her sinks also give lukewarm water. Only my tub is giving hot water in the master bath. The guest bath is fine. I was told that there could be a croosover at the faucets but it is 2 handled. So I am not sure how the cold water gets into the hot water pipe.
No. I tried replacing all cartridges for single handle faucets and the sink hot water faucets too. I shut off the laundry cold water supply. Nothing seems to change. Its like the master shower and sinks are on a different hot water line.
This is awkward, but...
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