I drained my central heating system to remove s couple of pipes that
used to feed a radiator that has not been on the wall since moving
into the house. The pipes were t'd in so I simply removed the T joints
and reconnected the pipes with some straight connectors. I then
refilled the system by turning on the water to the expansion tank in
the loft and bled as many of radiators as possible. Everything seemed
to be ok but:

1: The radiator in one of the bedrooms is warm at the bottom but not
at the top. I cannot find a bleed valve on it anywhere. Not at the
sides or the along the top at the back. There is a circular lump in
what I would consider to be a normal position but there is no valve
attached. Is this usual and if not how can I bleed it?

2: The radiaror in the bathroom remains cold. The pipes feeding it on
both sides are hot but the radiator remains cold. I have bled it and
there is only water coming out. Yes I have made sure the valves are
on. Any ideas?

3: There are two radiators on the ground floor that have both been
bled but remain cold (as do the pipes that feed them)!


All the other radiators are fine. Do I need to bleed the pump or
anywhere else other then the radiators? Sometimes I can hear what
sounds like water trickling in the pipes is this indicating anything?

The boiler also feeds the ho****er tank and this all seems fine so I
am now at a loss at to what I should do.

Thanks

In an earlier contribution to this discussion,
JJC001 wrote:

I drained my central heating system to remove s couple of pipes that
used to feed a radiator that has not been on the wall since moving
into the house. The pipes were t'd in so I simply removed the T joints
and reconnected the pipes with some straight connectors. I then
refilled the system by turning on the water to the expansion tank in
the loft and bled as many of radiators as possible. Everything seemed
to be ok but:

1: The radiator in one of the bedrooms is warm at the bottom but not
at the top. I cannot find a bleed valve on it anywhere. Not at the
sides or the along the top at the back. There is a circular lump in
what I would consider to be a normal position but there is no valve
attached. Is this usual and if not how can I bleed it?

2: The radiaror in the bathroom remains cold. The pipes feeding it on
both sides are hot but the radiator remains cold. I have bled it and
there is only water coming out. Yes I have made sure the valves are
on. Any ideas?

3: There are two radiators on the ground floor that have both been
bled but remain cold (as do the pipes that feed them)!


All the other radiators are fine. Do I need to bleed the pump or
anywhere else other then the radiators? Sometimes I can hear what
sounds like water trickling in the pipes is this indicating anything?

The boiler also feeds the ho****er tank and this all seems fine so I
am now at a loss at to what I should do.

Thanks

It is most unusual for a radiator not to have a bleed screw. Some are in
"unlikely" places! Can you post a reference to a of photo of it, to see
whether anyone recognises it and can tell you where the bleed screw is?

With regard to the radiators which don't get hot, you have an air lock in
one of the supply pipes. They still bleed ok, because the water comes via
the other pipe. The usual cure for this is to turn off all other radiators
except each of the problem ones in turn - so that all the water is forced
through just one radiator. You may also need to increase the pump speed
while you do this. This usually clears the air lock.

If this doesn't work, bleed each of the rad's pipes separately. Turn off one
valve so that water can only come in via the other pipe, and bleed quite a
lot of water (several pints) out of the bleed screw. Then swap to the other
valve and repeat. [If your system has been balanced, note the number of
turns required to close the lockshield valve, so that it can be returned to
the same position].

HTH.
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

In article , JJC001
writes
I drained my central heating system to remove s couple of pipes that
used to feed a radiator that has not been on the wall since moving
into the house. The pipes were t'd in so I simply removed the T joints
and reconnected the pipes with some straight connectors. I then
refilled the system by turning on the water to the expansion tank in
the loft and bled as many of radiators as possible. Everything seemed
to be ok but:

1: The radiator in one of the bedrooms is warm at the bottom but not
at the top. I cannot find a bleed valve on it anywhere. Not at the
sides or the along the top at the back. There is a circular lump in
what I would consider to be a normal position but there is no valve
attached. Is this usual and if not how can I bleed it?
The lump is a little plastic cap, the bleed screw is recessed in a hole.


--
Tim Mitchell

In article ,
Set Square wrote:
With regard to the radiators which don't get hot, you have an air lock
in one of the supply pipes. They still bleed ok, because the water comes
via the other pipe. The usual cure for this is to turn off all other
radiators except each of the problem ones in turn - so that all the
water is forced through just one radiator. You may also need to increase
the pump speed while you do this. This usually clears the air lock.

It may, but it's often just easier to 'pump' in mains pressure water via
the drain valve. Of course making sure you don't overfill the header tank.

It's the only way I can do it with mine. ;-)

--
*(on a baby-size shirt) "Party -- my crib -- two a.m

Dave Plowman London SW
To e-mail, change noise into sound.

Tim Mitchell wrote in message ...
In article , JJC001
writes
I drained my central heating system to remove s couple of pipes that
used to feed a radiator that has not been on the wall since moving
into the house. The pipes were t'd in so I simply removed the T joints
and reconnected the pipes with some straight connectors. I then
refilled the system by turning on the water to the expansion tank in
the loft and bled as many of radiators as possible. Everything seemed
to be ok but:

1: The radiator in one of the bedrooms is warm at the bottom but not
at the top. I cannot find a bleed valve on it anywhere. Not at the
sides or the along the top at the back. There is a circular lump in
what I would consider to be a normal position but there is no valve
attached. Is this usual and if not how can I bleed it?
The lump is a little plastic cap, the bleed screw is recessed in a hole.

Thanks all for the advice, a few turning off/on of various radiators
and bleeding them a few more times has resulted in some success. I can
confirm that the lump is a little plastic cap but alas still no bleed
valve. Perhaps the people who installed the radiator got lazy and
didn't put a bleed valve where the plastic plug is?

In article , JJC001
writes
Tim Mitchell wrote in message
...
In article , JJC001
writes
I drained my central heating system to remove s couple of pipes that
used to feed a radiator that has not been on the wall since moving
into the house. The pipes were t'd in so I simply removed the T joints
and reconnected the pipes with some straight connectors. I then
refilled the system by turning on the water to the expansion tank in
the loft and bled as many of radiators as possible. Everything seemed
to be ok but:

1: The radiator in one of the bedrooms is warm at the bottom but not
at the top. I cannot find a bleed valve on it anywhere. Not at the
sides or the along the top at the back. There is a circular lump in
what I would consider to be a normal position but there is no valve
attached. Is this usual and if not how can I bleed it?
The lump is a little plastic cap, the bleed screw is recessed in a hole.

Thanks all for the advice, a few turning off/on of various radiators
and bleeding them a few more times has resulted in some success. I can
confirm that the lump is a little plastic cap but alas still no bleed
valve. Perhaps the people who installed the radiator got lazy and
didn't put a bleed valve where the plastic plug is?


Have you peered down inside the hole? There should be a little square
peg in the bottom of the hole which is the end of the bleed screw.
--
Tim Mitchell

I think you might have misunderstood what Tim Mitchell meant. You remove
that white plastic cap - it's just a cover for the bleeding valve. Lift it
out and insert your key.

"D" P.doody@monkeynuts wrote in message ...
I think you might have misunderstood what Tim Mitchell meant. You remove
that white plastic cap - it's just a cover for the bleeding valve. Lift it
out and insert your key.

You are both right, the little plastic cap was indeed a cover for the
bleed valve, the only radiator in the house to have a cap over the
bleed valve but I still feel stupid for not realising. Thanks all for
your help, much appreciated!