Aleksander Piec
Aleksander Piec voted up Anonymous' answer

Rather than repairing it by yourself it is always better to contact professional plumbing services. Especially when you have a single faucet for both hot and cold water it is, even more complicated to repair it. If you try to do it yourself, there are chances you will end up making more … Read more

Aleksander Piec
Aleksander Piec voted up Anonymous' answer
Turn off the water to the house, and remove the screw on the knob.  Then remove the mixing cartridge with a wrench.  Take the old one to the hardware store and match it against the new one to be certain it's the correct one.  Then reverse the steps.   

If that doesn't fix it, then the whole valve … Read more