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My combi boiler wont pressurize the gauge isnt moving and water is coming out of the overflow pipe.. whats wrong

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Hi have you tried bleeding the rads this should solve the problem somewhat ,you will need to ajust the overflow in the water tank also but make sure to bleed the rads goodluck

Posted on Mar 19, 2011

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After moving my gas meter from inside the home to outside and having a semi concealed meter connected we cant get the combi boiler to work properly we can get hot water and have the gas fire on but


your boiler needs a minimum gas pressure of 16 mb to light successfully. if your gas pipe has been extended it has to be able to flow enough gas. it may need upgrading to 28mm for even as little as a metre from the gas meter. if your central heating works ok when the fire is off then this is your problem

Oct 12, 2014 | Water Heaters

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I keep having to top up with water every few days, but no leaks to be found, the pressure drops down to less than one and the boiler turns off, please can you help,


what kind of heater combi? if combi you may be pressurising boiler to high ie over 1 bar boiler may be blowing off through release valve check discharge pipe

Oct 28, 2009 | Water Heaters

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Worcester 350 boiler pressure low - warning light comes on so i top it up with water half an hour later the pressure drops again. Have checked rads and pipes no obvious leaks. Water seems to be coming out...


That overflow is the Pressure Relief Valve.usually they are set at 3-3.5 bar but over time they can be gunged up inside and leak/allow water to flow out. Dismantle & clean or replace. Turn off mains water and ch pipes before removing - operate valve remove & allow for some water to leak from it

Oct 15, 2009 | Water Heaters

1 Answer

I can't turn the bar pressure up on my Vaillant VCW 221 Boiler


on the pipework below there may be a silver braided hose with one or two valves on the end. turn the valve(s) so the handle is inline with the pipe this will allow water from the mains supply into the heating circuit , remember to keep an eye on the pressure gauge. fill the system to 1bar cold then shut down the valve(s). turn on the boiler and it should be ok, if you lose pressure again then you may have a leak somewhere which needs to be found.

Mar 25, 2009 | Water Heaters

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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.

Feb 03, 2009 | ACCO Brands Water Heaters

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Very Hot water coming out of overflow pipe


Is your boiler heating your domestic hot water if so i would turn water off to water maker and see if your boiler pressure stays down below 20 psi. If so water maker is bad. The other thing that could cause this problem would be the boiler pump is out.

Jan 22, 2009 | Protech Systems FasNSeal FSWMKE4 4" Vent...

2 Answers

Combi Boiler - Hot water pressure low


the coil inside got clogged

Dec 22, 2008 | Water Heaters

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Combi boiler wont re-pressurize when i turn the little valve under boiler it just seems to run and run and the pressure gauge dosent go up at all? there are no leeks. but a minute a go it went right up to...


the little valve is a one way type. this means the pressure should only flow one way. it's a good chance that the valve body is allowing the pressure to back flow. i would replace that valve. this should take care of it. please rate this thanks

Aug 29, 2008 | Water Heaters

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