screaching noise from mixer tap

30 Aug 2006
Reaction score
United Kingdom
I have recently fitted a mixer tap to my bathroom sink. the hot is fine, but the cold side makes a screaching noise apart from when it is open to full flow. The tap can't be faulty because I have tried swapping the hot and cold inlets- it only happens on the cold whether it is LEFT side or RIGHT side. when the toilet is flushed or the bathroom tap is on, the noise goes. I have tried reducing the pressure from the mains, but it makes no difference. I have tried putting a regulator valve on the pipe leading to the cold tap- it only slightly reduces the noise. when the taps were seperate before, there was no noise. Any other ideas how to stop this noise coming from the new mixer tap?
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This is becoming a more common problem. More so on cheap taps. U can fit a proper presure reducing valve on the water main proir to the tap & this will cure it but it will also reduce the flow. U can't reduce pressure with a stop tap only flow rate. will probably have to crank it down to about 1bar to stop it.
I have got a few ideas for illiminating.

Buy some new taps (with the intention of taking them back), to test the piping is definately the problem.

There is a dog leg of piping where I have moved the old toilet and left the old inlet to the flush sticking up with a block on. There could be air in that which needs bleeding - would that be casuing the screaching on the sink taps?

I have contacted the manufacturers (PHJ) who say it is a common problem but the tap is not faulty. they say that because the taps are a high pressure tap that needs the pressure to be set at 0.5 bars. How do I do that? apparently there is a gauge on my boiler - I can't see one. how will it effect the performance elsewhere i.e. shower. - would it be better to fit a water pressure regulator on a section of pipe prior to the mixer tap ?

Someone else suggested that pressure from both sides (hot and cold) must be equal going into the mixer tap. is this tripe?

it all points to a pressure problem because the noise goes when the toilet is flushed.

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