On Thu, 18 May 2006 06:44:17 -0700, Graham wrote:

Vaillant VCW GB 242E Over presure valve leaking - when the heating is
off and the pressure is set to 1 bar -

The over pressure 'saftey valve' is leaking slightly .. ie the system
pressure is slowly dropping and the there is a slow 'drip' from the
vent pipe out side ..

I see the valve appears to be part of the boiler - can be un-screwed -
leaving the housing behind ..

Question is ... can it be serviced ? or is it a sealed unit ? if you
unscrew the 'insert' do you also need to remove the housing to
change it ?

Just need a idea before I make a start !

You would replace this with one from a boiler spares shop (real or online).
The VCW is almost unique in having a 22mm discharge pipe on a boiler.
I've never had to replace one of these valve yet and there are a lot of
VCWs around.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
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Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards