Vokera Linea 24 problems

13 Dec 2008
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United Kingdom
Hi, wonder if anyone can help?

Vokera Linea 24, 5 years old, new expansion vessel this year. All working well. However:

1) For a couple of years now, there is a rattling noise from within the unit when the heating is on, sounding similar to something metallic being held against the spokes of a rotating wheel, or failing bearings rumbling. This has got louder and louder, reverberating throughout the entire radiator system, until it now wakes me up each morning when the heating comes on.

2) Recently the flow rate on the domestic hot water supply decreased to about 2 litres per minute, and this was accompanied by a gushing noise from within the unit when you turn on a hot tap (no leaks, water flowing v hot)- the sort of noise you would get when a cistern is filling. The flow rate has since returned nearly to normal, but the cistern noise still occurs at full flow.

A corgi repairer came out and decided that to fix number 2) above, new O-rings were needed. He took out the domestic hot water heat exchanger, but this was clear with no sediment / sludge whatsoever, and the O-rings are fine. Since then however, the cold water supply used to re-pressurise the system has an extremely low flow rate. Previously you could hear the water running in noisily as you would expect, whereas now it is barely discernable. I disconnected the fill loop braided pipe on the left hand side, and dirty water flowed out. I could open the fill tap and cold water flowed freely.

Is all of the above linked in any way?

Any ideas what may be going on here?

Many thanks

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It sounds as if you have a few faults probably starting with a failing pump.

As always I would recommend a competent CORGI boiler engineer.

Its probably the non return valve that is rattling and the flow restrictor will be knacked or blocked.
The non return valve on the filling loop is also shot.
Find someone who is familiar with Vokera.

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