Help! - how do i repessurise a Worcester-Bosch Greenstar 42 CDI

Hi all,

I removed a radiator to do some diy and had a problem with the TRV, as a result my CH system lost a few bowls of water.

I have now refitted the rad but my Worsester-Bosch Greenstar 42 CDI is showing zero pressure.

Will it take some time for the pressure to build? Or do i need to repressurise my system. There's no water tank in the loft so i presume i have sealed system and need to open a tap to refill it. Does anyone know where this is located on this boiler.

Thanks all, Bob

Reply to
bob
Loading thread data ...

You need to re-pressurise it... you should have a filling loop somewhere.

Have a look at Ed's sealed system FAQ:

formatting link

Reply to
John Rumm

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D\

=A0 =A0 =A0 =A0|

=A0 =A0 =A0 =A0|

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D/

Thanks John.

Ok, i have managed to locate the tap (control screw) thanks to the post below. How long do i leave it open for; how do i know when the system is pressurised?

formatting link
again, Bod

Reply to
bob

formatting link
should be a pressure gauge - you want to take it to about 1 bar (14 psi) while the system is cold. If you need to bleed the radiator, do that and then check the pressure again. You may need several bites at the cherry if you are working alone and the rad has lots of air in it. (if you have a helper - just have them bleed the rad, while you top up the pressure each every so often).

Reply to
John Rumm

Oh, and, see the bit titled "What should the pressure gauge be set to?" in Ed's FAQ

formatting link

Reply to
John Rumm

When the pressure gauge says so - usually 1 - 1.5 bar unless the boiler's on the ground floor of a building > 2 storeys high in which case maybe 1.5

- 2.

Reply to
John Stumbles

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D\

=A0 =A0 =A0 =A0|

=A0 =A0 =A0 =A0|

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D/

Thanks again John. One last question, should the boiler be powered on when i repressurise, will the pressure gauge work if its not?

Reply to
bob

The pressure gauge should work all the time. No harm in the power being on, although you don't want it actually running while you re-pressurise.

Reply to
John Rumm

T24gMTQgSnVsLCAwMDo0MiwgSm9obiBSdW1tIDxzZWUubXkuc2lnbmF0Li4uQG5vd2hlcmUubnVs bD4gd3JvdGU6DQo+IGJvYiB3cm90ZToNCj4gPiBUaGFua3MgYWdhaW4gSm9obi4goE9uZSBsYXN0 IHF1ZXN0aW9uLCBzaG91bGQgdGhlIGJvaWxlciBiZSBwb3dlcmVkIG9uDQo+ID4gd2hlbiBpIHJl cHJlc3N1cmlzZSwgd2lsbCB0aGUgcHJlc3N1cmUgZ2F1Z2Ugd29yayBpZiBpdHMgbm90Pw0KPg0K PiBUaGUgcHJlc3N1cmUgZ2F1Z2Ugc2hvdWxkIHdvcmsgYWxsIHRoZSB0aW1lLiBObyBoYXJtIGlu IHRoZSBwb3dlciBiZWluZw0KPiBvbiwgYWx0aG91Z2ggeW91IGRvbid0IHdhbnQgaXQgYWN0dWFs bHkgcnVubmluZyB3aGlsZSB5b3UgcmUtcHJlc3N1cmlzZS4NCj4NCj4gLS0NCj4gQ2hlZXJzLA0K Pg0KPiBKb2huLg0KPg0KPiAvPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT1cDQo+IHwgoCCgIKAgoCCgSW50ZXJub2RlIEx0ZCAt IKBodHRwOi8vd3d3LmludGVybm9kZS5jby51a6AgoCCgIKAgoCCgfA0KPiB8LS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS18DQo+ IHwgoCCgIKAgoEpvaG4gUnVtbSAtIGpvaG4oYXQpaW50ZXJub2RlKGRvdCljbyhkb3QpdWsgoCCg IKAgoCCgIKAgoHwNCj4gXD09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09Lw0KDQpUaGFua3MgSm9obiwgYWxsIHNvcnRlZCA6LSkh DQo=

Reply to
bob

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.