HI,
ive recently had a worcester bosch combi boiler fitter(24i junior) by
a corgi fitter who seemed very good if very expensive.
the problem is the pressure is dropping from week to week and requires
topping up. we have tried to locate the leak in pipework up to the
rads but to no avail.
i have checked the pipes entering the boiler at the bottom but these
appear fine.
the wall immediately below the boiler is slightly damp and it would
seem logical to assume some connection between this and the pressure
drop but as i have said i can seen no sign of leakage from the boiler
..
am i missing something ? are there any pipes further up in the boiler
that could be causing this?
any help or advice would be really welcome.

In article ,
(mark al) writes:
HI,
ive recently had a worcester bosch combi boiler fitter(24i junior) by
a corgi fitter who seemed very good if very expensive.
the problem is the pressure is dropping from week to week and requires
topping up. we have tried to locate the leak in pipework up to the
rads but to no avail.
i have checked the pipes entering the boiler at the bottom but these
appear fine.
the wall immediately below the boiler is slightly damp and it would
seem logical to assume some connection between this and the pressure
drop but as i have said i can seen no sign of leakage from the boiler
.
am i missing something ? are there any pipes further up in the boiler
that could be causing this?
any help or advice would be really welcome.

Are there any isolation valves in the circuit, for example, on the
pipes going in to the boiler? You could close them all (with the
boiler completely powered off of course, not even frost protection)
and try and work out which section is losing pressure. If there are
isolation valves on entry to the boiler and the pressure guage is
in the boiler so it will be measuring the pressure in that isolated
section, and the pressure still drops, there you have it. (If the
system's pressure vessel isn't in the boiler, the drop in this
situation will be very quick, although you would have to measure
this when the boiler had completely cooled down, as any further
cooling would give a misleading exaggerated pressure drop too.)

--
Andrew Gabriel

On Sat, 06 Dec 2003 14:00:54 +0000, Andrew Gabriel wrote:

In article ,
(mark al) writes:
HI,
ive recently had a worcester bosch combi boiler fitter(24i junior) by
a corgi fitter who seemed very good if very expensive.
the problem is the pressure is dropping from week to week and requires
topping up. we have tried to locate the leak in pipework up to the
rads but to no avail.
i have checked the pipes entering the boiler at the bottom but these
appear fine.
the wall immediately below the boiler is slightly damp and it would
seem logical to assume some connection between this and the pressure
drop but as i have said i can seen no sign of leakage from the boiler
.
am i missing something ? are there any pipes further up in the boiler
that could be causing this?
any help or advice would be really welcome.

Are there any isolation valves in the circuit, for example, on the
pipes going in to the boiler? You could close them all (with the
boiler completely powered off of course, not even frost protection)
and try and work out which section is losing pressure. If there are
isolation valves on entry to the boiler and the pressure guage is
in the boiler so it will be measuring the pressure in that isolated
section, and the pressure still drops, there you have it. (If the
system's pressure vessel isn't in the boiler, the drop in this
situation will be very quick, although you would have to measure
this when the boiler had completely cooled down, as any further
cooling would give a misleading exaggerated pressure drop too.)

Could be the pressure releif valve in the boiler - see FAQ below.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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