Every time you open the bathroom hot water shower or kitchen hot water faucet can hear from the bathroom

Every time you open the bathroom hot water shower or kitchen hot water faucet can hear from the bathroom next to the toilet issued a click

Answer:

That there is a leaking.

There may be a problem with the switch under your basin. When the faucet is turned on, the water flows to the sound of the main switch, so it is checked whether the switch has loosening the screw. If only the sound should be no big problem, but if you do not worry, I suggest you replace the basin under the switch.

Is because the triangular valve has a problem, open the other faucet when the pipe pressure relief, triangular valve ceramic spool sound

Hot water will lead to changes in the pressure within the pipeline, you hear the sound should be the sudden increase in the pressure of the hose sound, the hose is not fixed, you see is not what the hose encountered something.