Vokera Linea 24 DHW Temperature Cycling during drawoff

[Firbel]

Hi all, I have a problem with a Vokera Linea 24 Combi Boiler. On DHW drawoff the temperature cycles from hot to cold continually.
Having checked previous posts on this subject, the cause has been suggested as being the secondary heat exchanger, but with living in a soft water area is that likely to be the problem?
Thanks in anticipation

 

[weareleeds]

Not blocked on mains water side of plate heat ex it's the htg side. To test run hot tap & watch temp display (i assume it is a linea 24) when blr flame goes out then immediately turn the filling valve from the 12:00 position to the 09:00 position which stops water flow. The display then reads blr temperature if it is over 82 degrees then the plate heat ex is full of debris more than likely magnetit so will need flush

 

[Firbel]

Hi Weareleeds,

Thanks for the prompt response. I'll check it out as per your suggestion and report back. Can it be flushed in situ or do I need to remove it?
And yes, it is a Linea 24.

Thanks - Peter

 

[weareleeds]

You will probably need to fit another plate heat & then flush system or that will also fail