Urgent Help (Rad changed, and refilled system, but no water)

[gungaabayar]

Hi All

I just changed bathroom rad and refilled the open vent system leaving all rads bleeding valve open,
but no water come to rads. what Ive done wrong? help me please


cheers

 

[ShaunCorbs]

rad valves open?

if yes is there any water in the f and e tank (normally in the loft)

if yes sounds like cold feed block/ valve shut in the airing cupboard

 

[Chalked]

Could be the ball valve stuck in the off (up) position. As they rarely move, the can jam!
Go in the loft ad force the valve arm up and down until it starts to fill.

 

[Geyser]

Blockage in feed pipe, air lock or valve broken closed.

 

[gungaabayar]

rad valves open?

if yes is there any water in the f and e tank (normally in the loft)

if yes sounds like cold feed block/ valve shut in the airing cupboard

feed tank valve is working, I cleaned the small tank, and opened the valve again, water is in the tank now,

do I have to leave all rad valves open or shut when I start to refill the heating system,

There was some jelly thingy was in the tank, I wiped them out. could it block the feed pipe or not,

How to check if cold feed pipe blocked, if yes how can I remove the block plese
cheers

 

[ShaunCorbs]

if you have water in your f and e tank and you have opened the air tap on the empty rad cold feed blocked

and best to leave all rad vales open when filling

time to call a heating eng out (as to remove the blockage is either cut or of flush with mains water )

 

[joni os]

As others have said you have a blockage. Short term solution, if you have hose and convenient drain off point. Attach hose to drain off, open valve, and fill system from bottom up. Might even push blockage back to F&E tank. Vent all points, including pump.

 

[PlumbBobBob]

although back filling the system usually helps, I wouldn't attempt it if you are at all unsure of your abilities and certainly not at this time of night.

 

[gungaabayar]

although back filling the system usually helps, I wouldn't attempt it if you are at all unsure of your abilities and certainly not at this time of night.

this is the heating system diagram of my flat. Also there is a magna filter and auto air vent just before the boiler on the retun side. There were no water both of side of pump cos I checked it. Ball and gate valve on the F E tank is working. (I checked),

someone adviced me cut the cold feed pipe at the tee (Red circled on the photo) and use screwdriver to clean the sludge up and reassemble with speedfit( compressing) coupling,

Most likely blockage is there where cold and hot water often meets said,

Any advice on it please
cheers

P.S.
First Snow of the Year, No heating but many words from mrs.

 

[Riley]

Diagram doesn't look right vent and cold feed should be much closer than that you may have the wrong pipe. It could just be how it's drawn though. You're probably in the right ball park however you'd be better if cutting out the whole 'H' section though

 

[joni os]

Crud where cold feed meets main circulating pipework is usually magnetic. Test with magnet. Where magnet sticks to pipework confirms position of blockage. Fridge magnet will do.

 

[gungaabayar]

Diagram doesn't look right vent and cold feed should be much closer than that you may have the wrong pipe. It could just be how it's drawn though. You're probably in the right ball park however you'd be better if cutting out the whole 'H' section though

the vent and cold feed layout on this diagram is actual layout. No H layout here, very old system I guess.

 

[gungaabayar]

Crud where cold feed meets main circulating pipework is usually magnetic. Test with magnet. Where magnet sticks to pipework confirms position of blockage. Fridge magnet will do.

tried magnet on the suspected area (red circle on the diagram) but it doesn't stick there,

the heating system used to have strange situation before , like if I close or nearly close the valve on bathroom rad then boiler used to keep cut off while pump speed slow,
if pump speed higher then boiler works fine even bathroom rad closed.

recently bathroom rad had little leak on the bottom so it leads me to change it,

Question is how come system was working before I drained off yesterday if cold feed blocked.

Or the cold feed pipe blockage caused the bathroom rad problem I mentioned above,

any help please
cheers

 

[joni os]

Mention of previous boiler cut out, confirms circulation problem. Insufficient flow through boiler lead to cut out of overheat stat. As you have no water either side of pump, blockage is in your cold feed and independent of any rads. Don't cut out anywhere without replacement parts at hand. Not everything 15 & 22mm, maybe some 28mm or even 1" & 3/4" on old system. Steveb's advice is very sound, but with an unheated house and a wife full of kids you have to make a judgement call.

 

[gassafe]

I'd say call a plumber, there's only so much info we can advise on a forum, chances are you'll cut through the wrong pipe & being in a flat your neighbours below won't be thanking you...

 

[stevetheplumber]

back fill it and sort it out when the weather is better

 

[gungaabayar]

back fill it and sort it out when the weather is better

Latest update:

called plumber. He said cold feed is not blocked. so He back filled and bleeded all rads. Hot water no problem but rads are not 100. still some air inside. He said open vent system always has a problem after refill. Also He found a problem in the system. which is bypass valve which letting hot water through even it is completely shut. thats why boiler keep cutting out because of short circulation of hot water.

finally he recommended me to change current open vent into sealed system.
He can do it for £250 for labour + parts.

Question is now
1. need to go into sealed system?
2. Or just change the bypass valve and see how is it going?

any advice please
cheers

 

[plumb_know]

Pressurised systems are fine but always a risk of finding weak points in original pipework and rads when switching over to pressurised system