Noisy hot water

[Goonerman1]

When my system is cold and the timer kicks in and turns the hot water on it makes quite a bit of noise, gurgling and bubble noises but as soon as I slide the control over so that both the hot water AND the heating is on it all goes quiet then if I slide the heating off again and just leave the hot water on I get the noise again. Once everything is warmed up it seems to quieten down. Any help would be much appreciated.

 

[Boilerman2]

1) Air trapped in cylinder Coil
2) Lack of water flow though boiler when in hot water only mode

perhaps some pictures of your system layout would be useful??

 

[Goonerman1]

Thanks for the quick reply. Complete novice here so when you say a picture of my system layout do you mean this:

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[Goonerman1]

Also, any idea what the small yellow box is front right? I think it's something to do with the power shower but it isn't connected to anything.

 

[Goonerman1]

issue with the hot water 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. Where would I bleed this air from?


Anyone else got any ideas.