Noisy Hot Water System

[p_maidment78]

Morning,

I have just flushed my central heating system as it was blocked up and all went very well, the house is as warm as a warm thing in a warm place.

Sligh issue with the hot water now so I am wondering what I have done. We have a standard hot water system heated by a gas boiler and the central heating system is a bog standard one with header tank etc and when the hot water and the central heating are on at the same time it is as quiet as a mouse.

The issue is when the hot water only is on it is making a right old racket with I think a lot of air trapped between the boiler and the main hot water tank.

I have located a bleed valve by the tank and removed as much air as I can but it still makes the noises. What am I missing?

Any advice appreciated.

Paul.

 

[Gasman28]

It sounds like air is still in the DHW system. Run as per normal, then switch off. Now vent the hot water side again. Repeat as many times as required.

 

[Tod]

I have the same problem but can't locate a bleed valve on the hot water system. Where is it likely to be and silly question what might it look like?
There is a small belled valve on an upright pipe on the out side of the pump and after the two way valve. This is linked to the CH.