I guess it just depends on the day with my bathtub faucet. Yesterday was able to take a hot bath and this morning filled up the tub and when went to check the temp it was freezing cold. This has happened before but then will fix itself eventually... any hints. P.S. My husband nor myself are very handy so explain what to do to a 1st grader. Thanks!

Two handle faucet or one, do you know the brand or can you post a picture? Its likely a clogged hot water inlet on the valve.