Alpha C27 Squealing When Hot Water is on

[kendo2748]

Hi, I have a Alpha C27 Combi Gas Boiler which has started making a squealing noise when the hot water is on, no noise with central heating. It still makes the noise when the boiler is switched off at mains and hot tap running
.
I have found that if I reduce the water flow at the mains stop cock the noise goes away, however I would prefer a higher flow rate.

So I would be pleased to receive your thoughts/comments to what this might be, i.e. heat exchanger/flow regulator.

 

[Agile]

The rubber control element in the flow regulator has stretched out of position.

For all practical purpose the rubber can just be removed.

Thanks for clearly explaining the symptoms so that I can just tell you whats wrong!

Tony

 

[kendo2748]

Thanks Tony is this rubber easy to remove ? And is there a reason why it would fail in first place.

 

[Agile]

Anything on a boiler seems easy to me.

Sometimes an over high mains supply pressure might be the cause.

But its irrelevant as once removed the problem has gone.

Bit like tonsils or wisdom teeth!

Tony

 

[homes]

Anything on a boiler seems easy to me.

Sometimes an over high EGO might be the cause.

 

[kendo2748]

Its been a while and have been living with the lower water pressure. But at weekend I removed the flow regulator all together (little plastic disc thing) and the squealing has stopped, which is good. However re-read your advise above and you advise to remove only the rubber.

Can you see any problems not having the plastic flow regulator installed or should I order a replacement or fit the old plastic back in.

Appreciate your comments

 

[nickso]

forget it, it will make no difference now.

 

[Agile]

Unless the pressure is excessive you can leave it out.

I do wonder why you removed all of it though when I only said the rubber inside.

Tony

 

[kendo2748]

Yeah the pressure is the same as it was before the squealing started, so reckon it will be fine.

Yes Tony, I should have re-read your advice from November before I started, nevermind eh.

Thanks for your correct diagnosis