Can you have sludge build up in the DHW heat exchanger?

[Deleted member 105431]

checked the pressure going into the boiler...
same as much as the cold tap also.

(

in that case remove the plate and clean it all out.

 

[scatmanjohn]

Is it one of these?

Sabre se combi

If it is then there is no plate heat exchanger on it.

Take of front cover, follow cold mains inlet upto the heat exchanger.
Isolate cold mains,undo connection, remove small plastic flow restrictor,
reseal.
Any better?

 

[nikon70]

yes it is that exact one.


will check the flow restrictor now... gimme a sec

Is it one of these?

Sabre se combi

If it is then there is no plate heat exchanger on it.

Take of front cover, follow cold mains inlet upto the heat exchanger.
Isolate cold mains,undo connection, remove small plastic flow restrictor,
reseal.
Any better?

 

[nikon70]

where is the small plastic flow restrictor is it the pipe that enters the heat exchanger?

 

[nikon70]

at the bottom of the boiler there is the incoming cold with a black tap to stop the flow, it enters the boiler and connects to a black thing with two wires coming out of it and then copper pipe to the heat exchanger...

where would the small plastic flow restrictor be?

 

[Agile]

A similar Vokera boiler has it just inside the connection at the heat exchanger.

You undo the nut and move pipe a little and see it just inside the joint!

Tony

 

[DP]

Dangermouse, there is no danger of this boiler having a plate to plate heat exchanger—water is heated in the main heat exchanger. Problem lies elsewhere. In my opinion this is a good economy boiler.

 

[nikon70]

agile:

thanks found the flow restrictor and removed it and it seems to be back to the normal pressure (maybe a little bit less)

temperature heats up and stays constant too.

what does this mean? its fixed? or still needs a descale?

 

[Agile]

If it seems to be working normally then one could say that whatever the boiler needs there is nothing that YOU need to do!

The little rubber ring in the restrictor swells up and restricts nthe flow rate.

Tony

 

[nikon70]

agile, cheers

should the flow restrictor not be in place all the time?


as i am claiming under the insurance i am still getting the guys to come and descale it, see if that makes anything a bit better too.

 

[nikon70]

oh btw the flow restrictor was a red plastic circle with a star shaped thing in the middle....

does that sound about right?

 

[gavinda]

what insurance company covers a scaled heat exchanger?

 

[scatmanjohn]

oh btw the flow restrictor was a red plastic circle with a star shaped thing in the middle....

does that sound about right?

Thats it.