I have 3 radiators that are not heating properly.
I ran the system though with some cleaner fluid.
I have taken them off and flshed them with a pressure washer.
I have checked the valves.
Still having the problem, I then turned off all the other radiators,
and ran the boiler.
I then drained the system and the water was dirty, so i guessed that
theer was still stuf in the pipes.
I refilled, ran the system (still on the 3 rads) and drained again.
I repeated this several times.
I then ran a hose from the the drain tap to outside and turned on the
filling loop.
Now, heres my question.
The water at this stage runs clear, even if it is still running at
pressure through the system.
If I repeat my refill-run-drain process as before, the water comes out
a reddish colour.
This seems to be improving the rads, they are a lot better than before.

Is it the case that water running through the system (3 rads still) is
missing the dirt in the pipes, or is it the fact that the water is not
going through the boiler and being heated that it is not coming out a
reddish colour. I am going to be replacing my boiler soon, and dont
want to fit it with dirty stuff in the pipes, but dont want to be
flushing my pipes continuously if the boiler is the problem.
Thanks in advance.

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On Sat, 06 May 2006 12:59:39 -0700, Rob Walford wrote:

I have 3 radiators that are not heating properly.
I ran the system though with some cleaner fluid.
I have taken them off and flshed them with a pressure washer.
I have checked the valves.
Still having the problem, I then turned off all the other radiators,
and ran the boiler.
I then drained the system and the water was dirty, so i guessed that
theer was still stuf in the pipes.
I refilled, ran the system (still on the 3 rads) and drained again.
I repeated this several times.
I then ran a hose from the the drain tap to outside and turned on the
filling loop.
Now, heres my question.
The water at this stage runs clear, even if it is still running at
pressure through the system.
If I repeat my refill-run-drain process as before, the water comes out
a reddish colour.
This seems to be improving the rads, they are a lot better than before.

Is it the case that water running through the system (3 rads still) is
missing the dirt in the pipes, or is it the fact that the water is not
going through the boiler and being heated that it is not coming out a
reddish colour. I am going to be replacing my boiler soon, and dont
want to fit it with dirty stuff in the pipes, but dont want to be
flushing my pipes continuously if the boiler is the problem.
Thanks in advance.

You need to make sure that the water from the filling loop is being forced
the 'long' way round to the drain point. This may entail closing
flow/return isolators on the boiler and/or it may not be possible with
your current setup. You then need to make sure the water is going through
the each radiator one at a time - the process should be audible.


--
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

On 6 May 2006 12:59:39 -0700, "Rob Walford"
wrote:

I have 3 radiators that are not heating properly.
I ran the system though with some cleaner fluid.
I have taken them off and flshed them with a pressure washer.
I have checked the valves.
Still having the problem, I then turned off all the other radiators,
and ran the boiler.
I then drained the system and the water was dirty, so i guessed that
theer was still stuf in the pipes.
I refilled, ran the system (still on the 3 rads) and drained again.
I repeated this several times.
I then ran a hose from the the drain tap to outside and turned on the
filling loop.
Now, heres my question.
The water at this stage runs clear, even if it is still running at
pressure through the system.
If I repeat my refill-run-drain process as before, the water comes out
a reddish colour.
This seems to be improving the rads, they are a lot better than before.

Is it the case that water running through the system (3 rads still) is
missing the dirt in the pipes, or is it the fact that the water is not
going through the boiler and being heated that it is not coming out a
reddish colour. I am going to be replacing my boiler soon, and dont
want to fit it with dirty stuff in the pipes, but dont want to be
flushing my pipes continuously if the boiler is the problem.
Thanks in advance.


Try flushing at the radiators.

This can be a messy operation as you know, so warnings about covering
the floor with plastic sheet, towels etc. Sludge stains indellibly.
I am sure you are already aware of this.

Starting with radiators closest to the boiler, remove the radiator and
take it outside for flushing with pressure washer as you have been
doing.

Place a container under one radiator valve (cat litter tray from
supermarket is good for this). Turn on water at filling loop and
then open radiator valve. This will carry out crud that is in the
pipes as well. Repeat for other valve having closed the first.
Basically you are arranging that there is only one path for the water
and crud is flushed out of the system and not around it.

Repeat for other radiators Note that this technique will also flush
fresh water through the boiler.

You can mop up anything left by adding some desludging agent and
running the system hot for a few days (according to the instructions).
Then flush that thoroughly and refill with inhibitor.

When you do the boiler replacement, you should find that the water is
pretty clean, but in any case fit a strainer on the return to the
boiler just to mop up odd bits of copper swarf and general crud which
find their way into the system.


--

..andy