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How do I re-pressurise the boiler via the temporary filling loop

After bleeding the air from a radiator the pressure in the boiler dropped to zero, on the printed label on the boiler it states that the pressure must be between 1 and 2 bar, if it falls below 1 bar the heating must be re-pressurised via the temporary filling loop

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You may need to hook a hose to the drain and to a spigot depending on your water pressure in your home and back feed the unit to desired pressur,, does t have an auto matic feed valve or just a shut off valve,,

Posted on Jun 21, 2009

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Posted on Jan 02, 2017

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Loud noisy boiler what's wrong with it ?


Hi. I'm not an expert but most of my boilers in the past get noisy when they get air in the system. Underneath your boiler will be an inlet tap to top up the sysem with water. Make sure you bleed all of your radiators of air till they squirt water then keeb topping up the system and bleeding till no air remains in any of the radiators. There should be a pressure dial on the front of your boiler and there is usually a red fixed needle which shows what the opperating pressure is. I would do this before anything else and see if this solves the problem. :-)

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Identify the cold feed to the boiler, then look for a tap/service valve which when turned lets water into the boiler via a fill loop to pressurise it. 1-1.5 bar is ok
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The pressure drops very slowly over a month then needs topping uo from the filling loop to 1.5 bar. when the heating is on it goes upto 3 bar. the pipe outside is slightly damp. it was fine during the...


Sounds like the expansion vessel in the boiler has lost pressure or is faulty. If you have a tyre pressure gauge, locate the expansion vessl and check the pressure via the schraeder valve. It should be around 1.5 bar. If there is no pressure you can re pressurise it with a bicycle pump. Should it not pressurise then you will need a new one. The pressure relief pipework outside is damp because the system is over pressurising at relieving pressure at 3 bar. This obviously causes a system pressure drop. You can install a pressure vesel into the heating return pipework should accessing the boiler be difficult.

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Bled radiator and now boiler is losing pressure


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Vokera linea 28 boiler. I am continuously having to re-pressurise the loop (about twice weekly) also i keep getting a code 3 error appear which i know is a fan flue problem i have reset the boiler. The...


I have a similar problem with this boiler. When CH on, boiler overpressurises, (check relief valve outlet) You will then lose water from the CH loop and will have to repressurise when the CH loop cools. The problem is most likely caused by a loss of air from the expansion tank, which will need re-charged. This is not a big job as it has a standard tyre type valve connection but needs an accurate pressure gauge. Probably best left for plumber.

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Combi Boiler pressure gauge reading 0, and radiator half on!


The first thing you need to do is to put some more water into your heating system. This is usually done by allowing water from your (pressurised) domestic cold water supply to flow into the system: On older boilers, this is done with a connection (often made with a removable hose) on the pipework just outside the boiler. Newer boilers may have a built-in connection with some sort of removable link (sometimes looks like a plastic key).

Once you've got the boiler up to working pressure (typically about 1 bar - 15 psi), you should be able to bleed your upstairs radiator properly.

This may be all it takes, though the pressure excursions you're getting when you run the hot tap suggest there may be another problem. See what happens to the pressure as the boiler heats up and cools down. There really ought to be very little pressure difference between the two conditions. If you see significant changes, this usually means that the "pressure vessel" (or in hydraulic terms, system accumulaor) has lost its air charge.

The pressure vessel is a metal container inside the boiler, usually painted in red enamel. Somewhere near the top, you will find a schrader valve (like the one on a car tyre), and you can use this along with a tyre pump to replenish the air in the top of the vessel. This will reduce your pressure transients for a while, but you need to keep an eye on it. If the problem returns, you probably need to replace the pressure vessel (or clag another one into the plumbing alongside the boiler).

A.

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Worcester bosch greenstar 25Si?30Si pressure gauge showing high


a couple of things , is your filling loop disconected ? , and are all your radiators blead from air, have you got a high point where the air can get stuck in system say pipes going into roof etc you may need to fit a air release valve in line at highest point to remove the air from system , your boiler should be around 1.5 bar running preasure average setting . if you are constanly filling with water you could be exceeding the pressure valve limet which releases pressure from system this could be faulty ?

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1 Answer

How to re pressurisecentral heating system


Hi tiger650,

I'm Harvey the Master Plumber.

Your problem is: The Alpha SY24 boiler has stopped working. The pressure gauge has dropped, you need to know how to re pressurise the system once the radiators have been bled

Every hydronic heating system is required to have a presure regulator. Most guys call it a feeder valve. Every one I've installed or worked on had one. It's job is to keep the water pressure constant by adding water when you release some air without over filling the system. Sounds like it's not working. Some types can be serviced, others cannont so you may have to replace it. If you're not sure what to do it might be prudent to check the Repair Directory for a repairman.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

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