Upstairs do you get hot water to your sink faucet. If you do this indicates to me that the temperature valve in your Shower & Tub may need to be adjusted.
For single handle please remove handle to gain access to dial that adjusts hot & cold water mixing.
Remember where it is and take it out and replace about a 1/8 to 1/4 turn counter clockwise and reinstall and try.
It is a plastic adjustment dial that will slide off after the handle is removed.
Trace lines if possible to assure correct pipe's are connected to valve.
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