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Obviously he must have forgotten to do that! Thanks for advice. We will get in touch with a heating engineer tomorrow and see about having one installed. Hopefully that will get rid of the noise.

It is not a combi boiler - it is a Greenstar utility 32/50kw oiled fired condensing boiler. Does that have a built in valve?

The installer made a total hash of the installation so we don't want him back. Where should the bypass valve be positioned? I have looked on the internet and I don't think we have one...

We have had a Worcester boiler installed to replace our old boiler. Since it has been installed, there is a dreadful whistling sound coming from it when the heating comes on. The pitch changes depending on the amount of rads that are on. We have replaced the pump, thinking that was the...

But in a new boiler, what would cause a restriction? Is it something physical or is it back to the boiler being too big for the job? Thank you.

I know - wish you all lived in North Devon! :wink: Anyway, can I ask what you mean by restricted flow again?

You guys give more sensible and knowledgeable advice than any plumber I can find in this area! :lol: This forum has been a real eyeopener and I have learnt so much from you all. But, you are right, probably best not to say I've been looking on the internet. That must be so annoying!!

Sorry, what do you mean by restricted flow?

Thank you Tony. I have Worcester Engineer coming on Friday, so I will see what he says. I shall mention the things you said to him.

I found the installation completion report and the installer has noted the differential across the flow and return as 10 °c. That is probably more accurate than my reading I would think. Ok. Assuming my rads average 1kw and I have 23. That's 23kw load ( I assume). What about water...

Yes, there is an external ciirculatory pump, but I don't know about motor valves. I can't see anything that looks like what you suggest. Yes, the system was cleaned when the boiler was fitted (well, the installer wrote down on the warrantly that it was!) I measured the temperature of the...

I am really trying to understand about central heating systems. The noise only comes when the heating is switched on. We have the water on 24hr and there is never any noise when just the water is on. Therefore, it must be to do with the CH. The circulatory pump is new, (last week) so...

Thank you for your reply. I shall be in touch with Worcester. Although last night, I put all the rads on - they are all individually thermostatically controlled. The noise was still there. so we we had to turn everything off! It doesn't seem that we have a pass by pump...

The pump is Smedegaard. We replaced like for like. It has three settings and we have set it to number 2. It doesn't seem to make much difference which setting it is on. The noise comes regardless. I really think it is coming from the boiler. it has a pitch that when you turn a radiator up...

I wish I knew what an auto bypass valve is! I will check. We are running about 6 or 7 radiators, up to a maximum of 20 (we are a guest house). If we only have one or two rads on, the noise starts.

I had the above boiler installed a few months ago. After a while, a high pitched noise seemed to be vibrating through the pipes. We thought that it was the central heating pump had become worn out and was straining. We have just had this replaced, and the noise is still there! The plumber...