Hot water tap working but COLD water tap not working

[Sugar]

Hi all, 

I have double vanities in my bathroom. 

In one , Both COLD & HOT water tap works fine. Although it makes sounds when turning on COLD water tap.

In second one, HOT water tap works but COLD water tap does not work. It has been happening for 1 month ( almost). At some point, it had worked fine for a day or two after it showed problem for the first time but it lasted only for a day and now, no water is coming at all. 

What could be the problem? Is the water leaking somewhere affecting my house structure ( may be i am overthinking)? 

Should I get plumber to fix this or is it something I can do myself with some or little precautions ?

I hope I made my problem clear.

Thank you team. 

[MitchellMc]

Hi @BloodHammer,

It's always best to turn your water off at the mains, not just by the isolation taps; you never know when one of those might fail.

Please keep us updated.

Mitchell

[BloodHammer]

Well I sorted it, pulled the tap body out and the plastic washer that was in there had broken into 2 pieces, replaced with a quality washer and lubricated the spindle and that seems to have fixed my issues. Thank you