Gloworm 30CXi Combi-Boiler problem - low pressure. HELP ??? - HotUKDeals
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Gloworm 30CXi Combi-Boiler problem - low pressure. HELP ???

LazyDonkey Avatar
6y, 11m agoPosted 6 years, 11 months ago
The boiler pressure is 0.5bar and the warning light is flashing. I have tried restarting the boiler and the heating and hot water is working, but the pressure hasn't changed.

Under the boiler there is a blue colour knob (mains inlet tap). I've turned this anticlockwise to let water into the boiler and create a higher pressure, but nothing happens.

I was told that I should allow the water to flow in until the guage reads about 1 bar then turn off the knob. Sounds like an easy fix but no water is flowing in. Can anyone offer any assistance or help?
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LazyDonkey Avatar
6y, 11m agoPosted 6 years, 11 months ago
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#1
If there is no water flow when the valve has been opened could it be frozen further upstream?
#2
sure you've turned the valve all the way
[mod]#3
If no water is going into the system when your open the tap then you need a plumber. Could be a number of things wrong.
banned 1 Like #4
check that yoiu have plenty cold water flowing from your cold tap and if so then check the supply line with the blue tap to see if there is another tap that is closed further back, maybe a small inline steel valve with a plain screwdriver type head on it that needs to ne turned 90 degrees to open. If not then it saounds likie the previous poster may be right and you migt have a frozen pipe!
#5
Benson's Bargain
If there is no water flow when the valve has been opened could it be frozen further upstream?


No, all pipes are completely lagged and the cold water from all taps is working OK with a high pressure. The heating is working but the pressure is too low. The inlet tap doesn't seem to do anything which is strange? Normally (well about 6 months ago) when you open the value you can hear a 'rush' of water.
1 Like #6
As a prvious poster has said as well, might be worth checking that a further valve has not been inadvertantly shut. Failing that could be a non return valve problem. If all valves are deffo open sounds like plumber time, goodluck.
#7
renown
sure you've turned the valve all the way


Yes

hghghghg
check that yoiu have plenty cold water flowing from your cold tap and if so then check the supply line with the blue tap to see if there is another tap that is closed further back, maybe a small inline steel valve with a plain screwdriver type head on it that needs to ne turned 90 degrees to open. If not then it saounds likie the previous poster may be right and you migt have a frozen pipe!


Cant see any other tap or value.

Many thanks to you all for your help.
banned#8
Only other thing I could sugest to check is that the blue tap is not worn and that when you turn it that the steel srew in the centre is also turning at the same time as can sometimes ware out but if that doesnt work then I'dguess is time to call a plumber.
#9
hghghghg
Only other thing I could sugest to check is that the blue tap is not worn and that when you turn it that the steel srew in the centre is also turning at the same time as can sometimes ware out but if that doesnt work then I'dguess is time to call a plumber.


yep - my blue plug had rounded off so when i turned it nothing happened,
unscrew with a philips head screwdriver and use plyers or mole grips to turn the valve sorted it until i could change the plastic tap thing.
#10
On mine I have two silver mesh hoses with small black toggles. this is lower down.
If I want to alter the pressure. i open one and then the other and the needle moves up on the dial/ .perhaps you have these too?
#11
the silver ones are the proper ones.
the blue ones are for washing machines but they always end up on boilers.
that what we seem to have
#12
hghghghg
Only other thing I could sugest to check is that the blue tap is not worn and that when you turn it that the steel srew in the centre is also turning at the same time as can sometimes ware out but if that doesnt work then I'dguess is time to call a plumber.


This^^
#13
Well.......heating and hot water were OK, but came home tonight and nothing. Warning light on boiler is flashing and pressure is showing as 0.4bar. Have tried the normal fixes but nothing has happened. :x

Reading on another forum they stated the following:-

1) It seems that the filling loop tap brakes easily. This is the tap at the underside of the boiler with the blue knob: it is entirely made of plastic and the inner mechanics break *very* easily. You can try to fix it temporarily: remove the front panel (unscrew two screws at bottom of boiler, lift off panel), swivel the control panel forward, locate the filling tap, pull out retaining clips and remove the tap. Inside is a small write plastic part: this is probably stuck, push it with a screw driver, see if it moves now by twisting the blue knob. Install it again.

Mind you, it would be best to install a new tap, as a faulty filling tap will connect all your radiators to the pressure of the water mains and this might damage your boiler or your radiators.

2) I have just repressurised my 30CXI. Turn off all mains water. Open the valve using the blue plastic extension carefully. This is clockwise. Remove the two clips to the valve, some water may leak so a bowl underneath is handy! Look into the valve and use a small screwdriver to release the white plastic valve within. Replace after smearing the o rings with Vaseline and turn the water back on. The boiler will repressurise and as soon as the display hits 1bar plus, close the valve using the blue plastic extension. The plastic valve is prone to sticking and this is why the loop will not fill.

Should I try this (not too sure about turning off the mains) OR call someone out. British Gas do a flat rate call out of £210.........is that dear? No call out or part/labour....just the £210 !!
#14
I'm a central heating engineer and havent seen a filling system that doesnt have two valves to fill a system up with. You sure there isnt a second knob you need to turn before the water flows?
#15
pinkleponkle
I'm a central heating engineer and havent seen a filling system that doesnt have two valves to fill a system up with. You sure there isnt a second knob you need to turn before the water flows?


No, cant see anything. I think my only option is to call British Gas for there Fixed Fee Emergency Repair Service for £210 (in our area). At least the cost includes all parts/labour and call out. Probably an easy fix but I just don't have the time.

Been told it's £210 or £99 if you join the HomeCare Scheme for £22 a month.
#16
Sorry to highjack your thread, hope you get sorted soon x ;-)

Anyone know why my pressure keeps falling? I'm having to top up at least once a day. Boiler is only 2 years old, had a service about 10 months ago.

Oh and my boiler doesn't have 2 valves to fill it, just a small plastic knob on its underside.
1 Like #17
It's falling because water is coming out somewhere, look outside your property at the pressure relief termination. If not look under the floorboards on the ground floor.

Lazy roughly where in london are you? If you are north of the river I may be able to have a look for you.
#18
pinkleponkle
It's falling because water is coming out somewhere, look outside your property at the pressure relief termination. If not look under the floorboards on the ground floor.

Lazy roughly where in london are you? If you are north of the river I may be able to have a look for you.


Cheers Pinkle, thanks very much for the offer.......but Im South East. British Gas are are coming tomorrow between 8am-1pm. Probably find out it's just the value inside the filler tap, in regards to increasing the pressure.

As for the reason the pressure has dropped, is a leak the only real cause? The pressure was 1.2bar, but has gradually dropped to 0.9 and then 0.7 over the space of about 6 months. Each time we were able to top up the pressure slightly but not by much. Then overnight it dropped from 0.9 to 0.4 and the filler tap turns fully but nothing happens.
2 Likes #19
Well the pressure rises and falls depending on the heat of the water. A constant pressure drop is either water coming out the pipework within the house, water coming out the expansion relief valve, expansion vessel failure or split heat exchanger resulting in the heating mixing with the hot water and losing pressure out the hot tap.
#20
Thanks, repped ;-)
#21
I have a gloworm boiler and the pressure is nver right. I try and regulate it with a tiny little screw behind a panel that I don't think I'm supposed to touch. You have to turn it a miniscule amount with a screwdriver and the tiniest adjustment makes a huge difference to the pressure , it's always been a nightmare, and the radiators don't get very hot and it jsut sucks
#22
I have had the same problem 0.5 Bar and flashing red light, had 3 seperate plumbers out both condemed it and i am currently having a new boiler fitted NOT GLOWORM useless piece of junk never oh never will i have this again..

Gone for a Main unit more or less Baxi good reputattion time will tell, i tried the blue valve but that was fine on the gloworm water feeding through pressure was good but never got passed divertor valve, just a tip try draining system and re pressureise it may help if not it's a gonna sorry

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