Digital Spy

Search Digital Spy
 

DS Forums

 
 

Depressurise glow worm boiler?


Reply
Thread Tools Search this Thread
Old 17-01-2009, 20:20
robbarf7
Forum Member
 
Join Date: Dec 2004
Location: Over there >
Posts: 97

I need help with my glow worm 30cx boiler. I went to increase the bar pressure because it was to low at 0.7 bar, turned the nob up to 1.5 but the pressure carried on going up to 2.5. Must have needed to let it settle a bit. Can anyone tell me how to reduce the pressure, as i cant fine anything in the instruction manual. Thanks in advance. Rob
robbarf7 is offline   Reply With Quote
Please sign in or register to remove this advertisement.
Old 17-01-2009, 20:24
orangesmartie
Forum Member
 
Join Date: Nov 2005
Posts: 3,583
I have the same boiler. I don't know if you can reduce the pressure - do you still have your manual? If not i will dig mine out and have a look.

Make sure you tightened the blue knob back up again.
orangesmartie is offline   Reply With Quote
Old 17-01-2009, 20:26
fat controller
Forum Member
 
Join Date: Oct 2005
Location: Slightly round the bend
Posts: 12,685
Only thing I can think of is to open the bleed valve on a radiator whilst the boiler is running, and let some of the water out, thus reducing the pressure. I could be totally wrong though.

Look out for either 'the chimp' or 'seacam' on these boards as both are extremely knowledgeable at stuff like this.
fat controller is offline   Reply With Quote
Old 17-01-2009, 20:31
Cruachan
Forum Member
 
Join Date: Nov 2005
Location: West Midlands
Posts: 6,914
Only thing I can think of is to open the bleed valve on a radiator .
That'll do it ... I had to do it for a friend who did the same thing. Boiler does not need to be running, though, since the system is pressurised all the time.

EDIT: To be clear, you are not depressurising the boiler but the whole system. It's just that the boiler has the indicator to tell you what the pressure of the system is.
Cruachan is offline   Reply With Quote
Old 17-01-2009, 20:51
robbarf7
Forum Member
 
Join Date: Dec 2004
Location: Over there >
Posts: 97
Ive tried bleeding the system, pressure drops while im in the process but the it rises again once i seal it all off. Tried depressurising just the boiler as per instruction manual, isolating heating flow and return then turn the valve at the back. Same result pressure goes back up once closed. Simple job has turned in to head scratcher.
robbarf7 is offline   Reply With Quote
Old 17-01-2009, 20:51
Truffle Cart
Forum Member
 
Join Date: Dec 2008
Posts: 2,360
If you've overpressurised a combi-boiler I think it re-pressurises itself. I once turned the knob on mine to up the pressure a bit, and forgot to close it again. For 2 days. I think the pressure thing was around the 3 mark. The whole system started making a groaning noise and water pouring out of the overflow pipe that leads outside.

When I finally had the wit to realise I had the knob turned the wrong way, I shut it, and the system pressure levelled out after a while (and a bit more water pouring out of the pipe).

I agree with bleeding the radiators though as well!
Truffle Cart is offline   Reply With Quote
Old 17-01-2009, 20:52
Truffle Cart
Forum Member
 
Join Date: Dec 2008
Posts: 2,360
Ive tried bleeding the system, pressure drops while im in the process but the it rises again once i seal it all off. Tried depressurising just the boiler as per instruction manual, isolating heating flow and return then turn the valve at the back. Same result pressure goes back up once closed. Simple job has turned in to head scratcher.
Are you sure you have the knob closed and it's not still open? This is exactly what happened to me, I spent 2 days bleeding radiators till I realised.
Truffle Cart is offline   Reply With Quote
Old 17-01-2009, 20:59
fat controller
Forum Member
 
Join Date: Oct 2005
Location: Slightly round the bend
Posts: 12,685
Are you sure you have the knob closed and it's not still open? This is exactly what happened to me, I spent 2 days bleeding radiators till I realised.
I agree - sounds as though the valve may have jammed in the open position.
fat controller is offline   Reply With Quote
Old 17-01-2009, 21:21
seacam
Forum Member
 
Join Date: Oct 2005
Posts: 12,025
Hello robbarf7,

What is the preasure reading at now?
seacam is offline   Reply With Quote
Old 17-01-2009, 21:33
robbarf7
Forum Member
 
Join Date: Dec 2004
Location: Over there >
Posts: 97
Pressure has steadied out at 3.1 my partner says it has been there before bout 12 months ago, had an engineer out and all has been fine until now. Engineer didnt replace anything just reduced the pressure to normal.

Last edited by robbarf7 : 17-01-2009 at 21:47. Reason: Add info
robbarf7 is offline   Reply With Quote
Old 17-01-2009, 22:44
seacam
Forum Member
 
Join Date: Oct 2005
Posts: 12,025
Pressure has steadied out at 3.1 my partner says it has been there before bout 12 months ago, had an engineer out and all has been fine until now. Engineer didnt replace anything just reduced the pressure to normal.
3.1 is to high, it does sound to me either you are turning the wrong valve off or it's faulty.

Your could also have a faulty gauge, no matter, best way to de-pressurize is to go to a rad , if flat, furthest away, if house, ground floor for both examples below.

Make sure CH is off, turn off mains water and use drain cock if fitted, shallow bowl under drain off or hose,, couple of mug fulls only, tighten cock, turn mains back on and bleed rads as required, watch pressure gauge after every rad bleed.

Or if no drain cock, turn both rad valves off 1 rad, making sure you note how many turns this takes per valve so you can return to those positions.

Undo the large nut, either valve would do but best not TRV side, drain some water in to shallow bowl, couple of mug fulls, no more for now, tighten rad nut, return valves to position, bleed all rads as required, keep an eye on gauge, 1.5 bar is about right.

Repeat process if still to high, one mug full at a time.
seacam is offline   Reply With Quote
Old 18-01-2009, 20:36
robbarf7
Forum Member
 
Join Date: Dec 2004
Location: Over there >
Posts: 97
Would like to say thanks to you all. Problem solved. Pressurising tap was in the full open position. Must have got confused with it being up side down, clockwise to close . And depressurised like a charm at the rads.
robbarf7 is offline   Reply With Quote
Old 18-01-2009, 20:38
Truffle Cart
Forum Member
 
Join Date: Dec 2008
Posts: 2,360
Would like to say thanks to you all. Problem solved. Pressurising tap was in the full open position. Must have got confused with it being up side down, clockwise to close . And depressurised like a charm at the rads.
Glad you've sorted it out!
Truffle Cart is offline   Reply With Quote
Old 18-01-2009, 20:41
fat controller
Forum Member
 
Join Date: Oct 2005
Location: Slightly round the bend
Posts: 12,685
Good to hear that you've got it sorted robbarf7 - nothing worse than a poorly heating system at this time of year.
fat controller is offline   Reply With Quote
 
Reply



Thread Tools Search this Thread
Search this Thread:

Advanced Search

 
Forum Jump


All times are GMT +1. The time now is 22:48.