Hi all,

I've recently had to change the central heating pump because it was not
pumping hot water to the radiators. I tried turning the pump but could not
so I had to change the pump.

After changing the pump, the radiator upstairs was heating up just fine but
the radiators downstairs is cold. Can somebody suggest how I can get all
radiators working? Thanks in advance for any useful advice.

stuff wrote:
Hi all,

... Can somebody suggest how I can get all
radiators working? Thanks in advance for any useful advice.

Did you bleed all the rads starting with the downstairs ones?

"OldBill" wrote in message
...
stuff wrote:
Hi all,
... Can somebody suggest how I can get all
radiators working? Thanks in advance for any useful advice.

Did you bleed all the rads starting with the downstairs ones?

I drained the system by tying the float and draining the radiators and
opening the bleed tap on the upstairs radiators then installed a new pump
and pump valves as the old one was leaking

I have bled the upstairs then downstairs. i'll try to bleed it again.

Thanks for your help.

"stuff" wrote:
Hi all,

I've recently had to change the central heating pump because it was not
pumping hot water to the radiators. I tried turning the pump but could not
so I had to change the pump.

After changing the pump, the radiator upstairs was heating up just fine
but the radiators downstairs is cold. Can somebody suggest how I can get
all radiators working? Thanks in advance for any useful advice.

Did you drain the system and refill with water and inhibitor, or did you
just isolate the pump to replace it? If you drained and refilled then the CH
may need to be switched on for an hour or two, and all rads bled of air, to
remove air from the system. If you have done this and there is no
improvement the next thing is to turn the upstairs rad(s) off and see if
that results in the downstairs rads heating up. If the downstairs rads heat
up you should then turn the upstairs rads back on. If that results in the
upstairs rads getting hot but the downstairs rads get cold, that suggests
that the rads need balancing by adjusting their lockshield valves.

"DIY" wrote in message ...
"stuff" wrote:
Hi all,

I've recently had to change the central heating pump because it was not
pumping hot water to the radiators. I tried turning the pump but could
not so I had to change the pump.

After changing the pump, the radiator upstairs was heating up just fine
but the radiators downstairs is cold. Can somebody suggest how I can get
all radiators working? Thanks in advance for any useful advice.

Did you drain the system and refill with water and inhibitor, or did you
just isolate the pump to replace it? If you drained and refilled then the
CH may need to be switched on for an hour or two, and all rads bled of
air, to remove air from the system. If you have done this and there is no
improvement the next thing is to turn the upstairs rad(s) off and see if
that results in the downstairs rads heating up. If the downstairs rads
heat up you should then turn the upstairs rads back on. If that results in
the upstairs rads getting hot but the downstairs rads get cold, that
suggests that the rads need balancing by adjusting their lockshield
valves.


I drained the system by tying the float and draining the radiators and
opening the bleed tap on the upstairs radiators then installed a new pump
and pump valves as the old one was leaking

I have bled the upstairs then downstairs. i'll try to bleed it again.

i did read up on the balancing bit. i'll do that next.

Thanks for your help.

"stuff" wrote:
I drained the system by tying the float and draining the radiators and
opening the bleed tap on the upstairs radiators then installed a new pump
and pump valves as the old one was leaking

I have bled the upstairs then downstairs. i'll try to bleed it again.

i did read up on the balancing bit. i'll do that next.

You haven't mentioned draining the downstairs rads, or turning the upstairs
rads off to see if that results in the downstairs rads getting hot. Is it
possible that there is a sludge blockage somewhere on the downstairs
circuit? Balancing seems pointless unless you are sure that three are no
blockages anywhere.

"DIY" wrote in message ...
"stuff" wrote:
I drained the system by tying the float and draining the radiators and
opening the bleed tap on the upstairs radiators then installed a new pump
and pump valves as the old one was leaking

I have bled the upstairs then downstairs. i'll try to bleed it again.

i did read up on the balancing bit. i'll do that next.

You haven't mentioned draining the downstairs rads, or turning the
upstairs rads off to see if that results in the downstairs rads getting
hot. Is it possible that there is a sludge blockage somewhere on the
downstairs circuit? Balancing seems pointless unless you are sure that
three are no blockages anywhere.


that's what i thought, how can I check, and how do i unblock it? would the
raditors need to be removed?

"DIY" wrote in message ...
"stuff" wrote:
I drained the system by tying the float and draining the radiators and
opening the bleed tap on the upstairs radiators then installed a new pump
and pump valves as the old one was leaking

I have bled the upstairs then downstairs. i'll try to bleed it again.

i did read up on the balancing bit. i'll do that next.

You haven't mentioned draining the downstairs rads, or turning the
upstairs rads off to see if that results in the downstairs rads getting
hot. Is it possible that there is a sludge blockage somewhere on the
downstairs circuit? Balancing seems pointless unless you are sure that
three are no blockages anywhere.


that's what i thought, how can I check, and how do i unblock it? would the
raditors need to be removed?

"stuff" wrote:
that's what i thought, how can I check, and how do i unblock it? would
the
raditors need to be removed?

If there isn't a drainage tap on any of the downstairs pipes then you will
have to turn off a radiator and somehow attach a hose pipe and run that to
an outside drain. If you then allow water to enter the header tank it should
then flush out the system. If it doesn't then there might be a blockage due
to sludge so power flushing might be needed. What effect does running the
system with all the upstairs rads turned off? Do any of the downstairs rads
warm up?