Washers failing, washer seat pitting or corroding causing washers to fail quickly, hard to turn - oring needs to be re greased.
That water is used in the cold taps in your bathroom and for the heated water you use. Don't drink from these taps.
Usually there are no letters on French taps; some old taps bear the letters C (for chaud = hot) and F (froid = cold). Hot water taps are always located on the left side, cold water taps on the right. It is also standard to find color marks (blue for cold, red for hot) on the taps. On newer models, having a central lever instead of two taps, you turn the lever to the left for hot water and to the right for more cold water. Also the blue and red marks may be found on these type of taps.
Very easy once the supply lines to both the hot and cold water supply are shut and then work can proceed on changing out the "taps"
The aerator to the cold taps may be jammed, otherwise check to see that the cold water valve is switched on.
No, cold water is piped into the hot water tank and is heated by electricity or gas, it then flows out to the hot water taps.
The cutoff valve from the hot water heater may have been closed.
If possible, install hammer arrestors in hot and cold water mains.
It means hot water while the blue side means cold
No, the cold water supplies the water heater also. No water coming in means no water at all.
Not all plumbing devices do; some have combined hot/cold taps. In either case, hot and cold water lines are separate, the hot water coming from a water heater. The simplest taps merely control each line, letting the user measure out how much of each they want.
if someone put in a hot water tank they may have the lines switched.
Mixer taps are extremely easy to use and one does not constantly have to try and get the perfect temperature and mixture of hot and cold water. Also one can make sure that hot water is not being overused.