Why would my boiler be making a very strange grinding/straining noise when the hot tap is put on ?

[bizzey]

Hard to explain the noise , but it is loud !

At first we thought it was the pressure pump making the noise but now we know it is all hot taps.

I know I will need to get someone out to check but does it mean it is ready to blow up .

Hoping it might be a quick fix ?

It does not happen when the heating is put on .

Thanks ,if anyone has any ideas what I am looking at .

Is it a combi boiler then?

No , not a combi .

Good point !

I need to check it while water is not on to heat.

an airlock? may need to bleed the radiators.

Ok.
Water not on to heat.
DC is having shower and it is making noise.

But not as loud as when water is heating maybe .?

I am starting to confuse my self now 😂.

I am an annoying person who likes to tell boiler person all situations .

Air lock good call.

I can do that today.

Ours made that noise, it was the pump

No idea but we also have this problem..only with the hot taps..it gies off when the cold tap us turned on.

Thank everyone.
I bled the radiators and they are fine.

Looks like I am going to have to call someone and clear out my airing cupboard!

I had this problem, and it was an airlock. I searched for a fix and it worked. It was easy and I didn't cost anything, but you'd be better off asking PigletJohn