We have 3 upper level bathrooms where the shower temp has drastically changed in "2" of them. Our master bedroom shower all of a sudden only puts out only COLD water & my son's shower is scalding HOT? This happened to coincide immediately after we had a new refrigerator delivered from H. Depot and the service/delivery person shut our main water supply off while setting up the refrigerator? Our water heater is only 1 year old...how do we fix this! Could it have anything to do with them shutting the main water supply off while getting our fridge set up?

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    What kind of water heater is this--a gas fired tank or an electric powered tank or a gas fired tankless or something else? – Jim Stewart Feb 26 '17 at 15:50
  • A standard tank or a "tankless"? What size and do you have only one water heater? We have only one, but many houses in Dallas larger than our 2100 sq ft single story rancher have two. Is it possible you have more than one water heater? Go around the house and open all the hot water taps in showers, tubs, lavatories, kitchen, laundry room and let them all run for 1 to 2 min. At the end of 1 to 2 min are they all hot? If not, which are cold? Then check your shower again. – Jim Stewart Feb 26 '17 at 20:41
  • In your bathroom with the shower running cold does the lavatory run hot? – Jim Stewart Feb 26 '17 at 20:46
  • It is a standard tank and we have "1"... Our house is 3,700 square feet. I'll check size and do what you suggested! Also, in our Master Bath, the (separate) bathtub and 2 sinks both get hot...it's just the shower that's cold. – Susie Feb 26 '17 at 22:03
  • I assume that you have one of those modern anti-scald valves on your shower, right? Most are single handle and prevent water that is too hot coming out of the shower. It sounds to me that something went wrong with it when the water was turned off. Maybe it got jammed when the pressure dropped to zero and then suddenly came back on. The lavatories and (I think) the tub faucet do not have anti-scald valves. – Jim Stewart Feb 26 '17 at 23:50

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