I live in a complex where water is fed under pressure. Off-late, I noticed that there were squealing sounds coming from the bathroom. I investigated some and found that it is coming from the hot water pipe connected to the geyser. I close the cold water inlet, the problem goes away. I turn on the hot water tap slightly, the problem goes away. So, I am sure it has something to do with the water inlet or geyser. Unlike other posts I have read where the problem seems to be happening when the taps are opened or toilets are flushed, this seems to happen when there is no water movement through the geyser.

How do I fix this problem? Is it related to the washer being loose in the inlet valve or something else? Any help is appreciated!