"Johan" wrote in message
...
John Stumbles wrote:

Johan wrote:

Doctor Evil wrote:

snip


It could be that through the combi when a tap is opened the pressure
becomes
negative in relation to the rest of the cold water pipework. When
you close
the tap the pressure increases in the pipework and moves across the
combi
and activates the flow switch, or the 3-way valve. What make of
combi, they
don't all work the same way?

You could

1. Insert a none return valve just before the combi. Then this will
not
allow pressure to lower inside the combi and hot water pipework.



The boiler is a Vokera Linea.

I'm not familiar with this model but if it's a type that doesn't have a
diverter valve then you absolutely must NOT put a non-return valve in
the supply side (from the mains): it should say this in the manual.

The manual says there is a diverter valve, but this appears to direct
the water either through the central heating, or through the Domestic
heat exchanger (to produce hot water). How does this affect putting a
non-return valve in the hot water pipe after the boiler?
It does not say anywhere in the manual that a non-return valve should
not be used in the water supply, it also doesn't say that it is ok.....
Sorry to keep asking questions, but I'd really like to understand this
problem now.

Johan,

No problem, you can put one on. See my other post.


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