Hi, about 3 yrs ago i had a complete central heating system fitted the
boiler is a Halstead ace high and recently i've noticed the press gauge
reads less than .5 bar and yesterday after the heating had been on, the
press reading was zero and the boiler had locked out, i opened the
inlet v/v and got the system press up to 1.5 bar and it lit....am i
right in thinking there is a leak in the system,i have checked the
obvious places but not taken any floorboards up yet,or is there a part
on the boiler that may be at fault? many thanks.

wrote:
Hi, about 3 yrs ago i had a complete central heating system fitted the
boiler is a Halstead ace high and recently i've noticed the press gauge
reads less than .5 bar and yesterday after the heating had been on, the
press reading was zero and the boiler had locked out, i opened the
inlet v/v and got the system press up to 1.5 bar and it lit....am i
right in thinking there is a leak in the system,i have checked the
obvious places but not taken any floorboards up yet,or is there a part
on the boiler that may be at fault? many thanks.

Mine does this once a year or so as well.

I just repressurise it and wait another year.

In an earlier contribution to this discussion,
wrote:

Hi, about 3 yrs ago i had a complete central heating system fitted the
boiler is a Halstead ace high and recently i've noticed the press
gauge reads less than .5 bar and yesterday after the heating had been
on, the press reading was zero and the boiler had locked out, i
opened the inlet v/v and got the system press up to 1.5 bar and it
lit....am i right in thinking there is a leak in the system,i have
checked the obvious places but not taken any floorboards up yet,or is
there a part on the boiler that may be at fault? many thanks.

There's a distinct possibility that you may have a problem with the pressure
vessel. If this loses its air - needing re-charging - or fails completely,
the water in the system has no 'elbow room' in which to expand when its gets
hot. The result is that you pressurise the system cold, turn it on so that
it gets hot, the water expands and the pressure rises above 3 bar - causing
the pressure relief valve to operate. The system cools down again and,
because water has been lost through the relief valve, the pressure falls to
zero or near to zero.

The pressure relief valve will discharge through an outside wall. You need
to find the pipe, and hang a tin under it to collect any water which comes
out. Then re-pressurise your system cold and run it again - and see whether
any water collects in the tin. If it does (other than rainwater!), my
suggested diagnosis is correct. If this is the case, come back - and we'll
tell you what to do next.
--
Cheers,
Roger
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wrote:
Hi, about 3 yrs ago i had a complete central heating system fitted the
boiler is a Halstead ace high and recently i've noticed the press gauge
reads less than .5 bar and yesterday after the heating had been on, the
press reading was zero and the boiler had locked out, i opened the
inlet v/v and got the system press up to 1.5 bar and it lit....am i
right in thinking there is a leak in the system,i have checked the
obvious places but not taken any floorboards up yet,or is there a part
on the boiler that may be at fault? many thanks.

The manual valves which are situated infront and behind the pump
(water) are buggers for leaking, and are hard to spot, they leak when
cold and seal when hot, the rubber washer in them perishes. both mine
are weeping slightly, when I get around to it I'll pull em and solder
them up, it only means a system drain if I need to replace the pump.

On Tue, 17 Oct 2006 04:03:25 -0700, steve wrote:

Hi, about 3 yrs ago i had a complete central heating system fitted the
boiler is a Halstead ace high and recently i've noticed the press gauge
reads less than .5 bar and yesterday after the heating had been on, the
press reading was zero and the boiler had locked out, i opened the
inlet v/v and got the system press up to 1.5 bar and it lit....am i
right in thinking there is a leak in the system,i have checked the
obvious places but not taken any floorboards up yet,or is there a part
on the boiler that may be at fault? many thanks.



check out the SealedCH FAQ.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards