I have just moved into a flat with a bosch worcester combination boiler that
was fitted in January 2006. I called out a service engineer as the pressure
was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework is
housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have to
have my floors dug up!
Any ideas on what I should do next would be gratefully received.

Regards

Melanie

Melanie Birtchnell wrote:
I have just moved into a flat with a bosch worcester combination boiler that
was fitted in January 2006. I called out a service engineer as the pressure
was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework is
housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have to
have my floors dug up!
Any ideas on what I should do next would be gratefully received.

Regards

Melanie



Running new pipework above floor level is probably your best option.
That's a lot of water to be losing without seeing evidence somewhere.
Are you ground floor?

On Sat, 12 May 2007 11:16:53 +0000, Melanie Birtchnell wrote:

I have just moved into a flat with a bosch worcester combination boiler that
was fitted in January 2006. I called out a service engineer as the pressure
was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework is
housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have to
have my floors dug up!
Any ideas on what I should do next would be gratefully received.

An outline answer here

http://wiki.diyfaq.org.uk/index.php?..._Repair#system
pressure dropping

--
John Stumbles

"Melanie Birtchnell" wrote in message
...
I have just moved into a flat with a bosch worcester combination boiler
that was fitted in January 2006. I called out a service engineer as the
pressure was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework
is housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have
to have my floors dug up!
Any ideas on what I should do next would be gratefully received.

Regards

Melanie


One possible source of leakage (that affected my Eco Hometec combi boiler
recently) is the pressure relief valve.

We had the boiler repaired (failed diverter valve) and after isolating the
boiler from all the pipework, the repairman drained the small amount of
water that lives in the boiler and its internal expansion vessel by
releasing the pressure relief valve (a third of a turn on the little knob
thereon). Seems a bit of crud was left on the valve seat so it did not fully
close causing quite rapid pressure loss. On my boiler the PRV outlet goes to
the condensate drain so there is no outside visble sign that it is leaking.

To fix it I had to release pressure a few times quite "rapidly", flushing
out the valve, and it has been fine since - touch wood.

Anyway, might be worth a peep.

Regards,
Simon.

In article ,
"Simon Stroud" writes:
On my boiler the PRV outlet goes to
the condensate drain so there is no outside visble sign that it is leaking.

Pretty sure that is a very long way from conforming to the
regs, and could potentially be quite dangerous.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Andrew Gabriel" wrote in message
...
In article ,
"Simon Stroud" writes:
On my boiler the PRV outlet goes to
the condensate drain so there is no outside visble sign that it is
leaking.

Pretty sure that is a very long way from conforming to the
regs, and could potentially be quite dangerous.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Hmmmm... well it's actually all combined by the manufacturer (MAN
Heiztechnik) INSIDE the boiler, not by the installer. So hopefully it's OK!

You would be able to tell if it was actually venting, but what I mean is
that looking at the slow drip of condensate in normal operation, you
wouldn't be able to detect the extra extremely slight seepage of the weeping
PRV. The flexible clear tube that connects to the PRV outlet inside the
boiler is always all steamy inside because it is full of condensate/moist
vapour, so to detect the fault I had to remove this pipe for a while so I
could see the very slow drip from the valve.

Regards,
Simon.

In article ,
"Simon Stroud" writes:

"Andrew Gabriel" wrote in message
...
In article ,
"Simon Stroud" writes:
On my boiler the PRV outlet goes to
the condensate drain so there is no outside visble sign that it is
leaking.

Pretty sure that is a very long way from conforming to the
regs, and could potentially be quite dangerous.

Hmmmm... well it's actually all combined by the manufacturer (MAN
Heiztechnik) INSIDE the boiler, not by the installer. So hopefully it's OK!

You would be able to tell if it was actually venting, but what I mean is
that looking at the slow drip of condensate in normal operation, you
wouldn't be able to detect the extra extremely slight seepage of the weeping
PRV. The flexible clear tube that connects to the PRV outlet inside the
boiler is always all steamy inside because it is full of condensate/moist
vapour, so to detect the fault I had to remove this pipe for a while so I
could see the very slow drip from the valve.

How strange. I wonder how it copes with a system which boils
and ejects super heated water and steam from the PRV?
Maybe they just don't consider that a possibility.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Simon Stroud wrote:
"Melanie Birtchnell" wrote in message
...
I have just moved into a flat with a bosch worcester combination boiler
that was fitted in January 2006. I called out a service engineer as the
pressure was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework
is housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have
to have my floors dug up!
Any ideas on what I should do next would be gratefully received.

Regards

Melanie


One possible source of leakage (that affected my Eco Hometec combi boiler
recently) is the pressure relief valve.

We had the boiler repaired (failed diverter valve) and after isolating the
boiler from all the pipework, the repairman drained the small amount of
water that lives in the boiler and its internal expansion vessel by
releasing the pressure relief valve (a third of a turn on the little knob
thereon). Seems a bit of crud was left on the valve seat so it did not fully
close causing quite rapid pressure loss. On my boiler the PRV outlet goes to
the condensate drain so there is no outside visble sign that it is leaking.

To fix it I had to release pressure a few times quite "rapidly", flushing
out the valve, and it has been fine since - touch wood.

Anyway, might be worth a peep.

But an engineer has already looked at the boiler

In message , Melanie
Birtchnell writes
I have just moved into a flat with a bosch worcester combination boiler that
was fitted in January 2006. I called out a service engineer as the pressure
was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework is
housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have to
have my floors dug up!
Any ideas on what I should do next would be gratefully received.

I've just been through a long diagnosis process with my combi boiler
depressurising daily. At first I thought it was a leak in the CH, but
couldn't find one, then left the CH and hot water unused for 24hours and
the pressure didn't drop, eventually it appeared to be that the system
was losing pressure when the hot water was run, but only if the heating
wasn't being used, due to the combined heat exchanger overheating.
Having descaled the boiler's DHW heat exchanger (not the CH heat
exchanger) the problem has gone away.

--
bof at bof dot me dot uk

On May 12, 12:16 pm, "Melanie Birtchnell"
wrote:
I have just moved into a flat with a bosch worcester combination boiler that
was fitted in January 2006. I called out a service engineer as the pressure
was dropping from 1.5 to 0 on a daily basis.
I have been told that I have a leak, which is undetected as the pipework is
housed under my concrete floor!
I have injected a sealant into the system which has reduced the pressure
loss to 1.5 - 0 over 5 days. Still not perfect.
There is no sign of water damage anywhere, I obviously don't want to have to
have my floors dug up!
Any ideas on what I should do next would be gratefully received.

Regards

Melanie
Contact Worcester on 0870 5266241 and make sure your engineer is Corgi
registered. Try the local paper and not yellow pages for the engineers
as they are cheaper in the papers. If you can give them some technical
terms on the phone, they will usually give you free advice anyway.

Trevor
http://www.sayworth.co.uk - Bathroom advice and forums