I own a home that is 5 years-old. I lived in it since it was built. I noticed that there was no hot water coming out. I shut off the main valve to the house and took of the single handle. I then took off the guts inside of the fixture, had my son turnt eh water back on and noticed that the water was comng out off only one tube and the second one was dry. The house is relatively new and has no galvanized pipes. I also notice last night that the sink in my garage has no hot water as well. The rest of the house is okay. Can anybody help me with this and possible trouble shooting tips or possible solutions? Thank you.