Replacement for Myson SD53 pump?

[elsmandino]

Hello,

I have an old Barlo Balmoral gas boiler that started to make a very strange banging noise and then suddenly cut off.

At first, I thought it might be trapped air and drained and refilled my central heating but this did not cure the problem.

I have managed to pull off the facia that covered the pipes leading to the boiler, for a closer look, and it now looks like the problem is in the pipe that carries the hot water away from the boiler.

The clunking sounded like two of the pipes are whacking together but buy listening and feeling the pipe (was a bit stupid and got burnt the first time), it sounds like the clunking is from a blockage in the pipe – it sounds like a stone is in there.

I can also feel the hot water try to go along the pipe but when the clunking stops and the boiler cuts out, it appears to run backwards towards the boiler.

Am I correct in thinking that it is possible to get such a build-up of scale that it forms a big lump that can obstruct a pipe?

If so, can anyone suggest a strong agent to put in the system and dissolve it? (There is a B&Q or Screwfix near where I live).

Any help would be much appreciated.

 

[elsmandino]

Just had another look at this further and note recommendations for either ernox f3 or sentinel x400.

However, is this going to work if I am having problems getting the boiler going in the first place?

I.e. is it enough just to drain the system, pour the liquid down and hope that it will eventually get to the blockage or does the central heating actually have to be used for the liquid to work?

 

[ianmcd]

Check your pump first, sounds as though it might be seized

 

[elsmandino]

Hello,

I think you might be on to something here.

The pump is making a slight wine - I am not sure, however, if it has always done this but I am just aware of it now.

It is also very hot - almost too hot to touch.

However, there does seem to be some vibration coming from it?

Is there any way I can definitively tell whether the pump is knackered?

Thanks again.

 

[elsmandino]

I have had another fiddle with the pump (which is a Myson SD53) and note that if I unscrew the little bolt in the middle and pull it out to engage the pump, I can swivel it fairly easily in either direction.

However, if I turn the pump on, I can feel that that the bolt is not moving at all, so I think that it really is dead.

Time for a new one - I note from the net that they don't make my pump anymore, so what do you guys recommend as a replacement?

Are they all interchangeable (I note that there are a few brands out there) or do I have to be a bit careful about what I choose?

Is it possible that I might find a pump with identical specs but just change the head (i.e. leaving the back plumbed in)?

Thanks

Alex