Vaillant VCW GB 242E Over pressure valve leaking

[Graham]

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 !

Tnx G ,

[Ed Sirett]

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.

[Graham]

looks that way .. suppose the best option is to buy a new one and see whats in the box before I start on it ..

.=2E local supp recons its about =A320 for the valve .. might even replace the out put temp gauge at the same time as its been broken for the last

5/7 years !