1 of 3 switches buzzes when in on position

[sourkj]

I have a problem with my light switch. There are three switches two of which work perfectly. However, the third switch buzzes when turned on; and the light flickers from time to time.

Your advice would be appreciated.

Thanks

 

[plugwash]

start by checking for dodgy connections

failing that replace the switch

are you actually in canda? if so then it may be better for you two find a local forum (the basic principles of leccy don't change but the installation details do)