backflush main HE ariston a23 MFFI

[jonwish]

Hi,
Could anyone tell me how to backflush a main heat exchanger on an Ariston a23/MMFI Eurocombi please. (in easy steps)

Thanks

 

[Agile]

I dont know exactly what you want to do or why!

But generally any work on the main HE should be by a gas reg person!

Tony

 

[jonwish]

I read somewhere that you could undo the pipes below the boiler and backflush the main HE to get rid of some crud.
So I wouldnt need to touch the boiler at all if this were the case. Its just knowing which valves to turn off etc.

 

[Agile]

What is this "crud" you think is in your boiler?

As you will not have seen it then how do you know that it is there?

Tony

 

[jonwish]

Noisy. sounds like a ww2 plane going overhead when HW turned on. Doesnt do it with CH just when HW turned on after about 10 seconds the noise starts.

 

[Agile]

That could well be lime scaling.

It could also be wrong gas settings too.

Lime scaling can only be removed by dissolving in the right acids!

Tony

 

[jonwish]

Thanks for the advice. Really appreciate it.
Could I ask: just a rough guestimate how much a new main HE would cost for the a23MFFI fitted.
Im in North Yorks, York.

+ Could it be the secondary HE thats the issue?

Thanks for any advice