noise from hot water run in bathroom causes kitchen tap to drip

[raindrops]

Hello
My bathroom is above my kitchen. When I run any hot tap inthe bathroom (not the shower which has a separate pump) a horrible droning,humming noise reverberates. If I go to my kitchen mixer tap, the noise is worstin the wall behind it. The problem started a few weeks ago just out of the blue.No work has been done on any plumbing.
The three taps in the bathroom are also mixer taps.Sometimes I can stop the noise by swivelling the wash hand basin tap over tocold and back to hot. Hit and miss
I can relieve the noise by running the hot tap in thekitchen for a second. This tap starts to drip when this whole noise happens.
My hot water is fed from a tank in the loft coming down tomy cylinder in the airing cupboard.
What we have already tried:
1. Checking the washer on the hot water side of the mixingtap. The washer is fine.
2. Finger over the kitchen miser tap and running the taps(assuming it is an airlock and trying to do something about it). This is verymessy as water just splurges out and it didn’t resolve it.
Would welcome any advice!
Many thanks

 

[PlumbBobBob]

hi raindrops welcome to the forums. most likely the ballcock in the larger loft tank needs looking at.

 

[marinegmillie]

As steveb says, as you run hot tap, cylinder refills from larger cistern in loft and operates prob faulty ballcock washer,