cold rads downstairs, help.

[roylufc]

gravity fed HW, pumped C/H.
the pump is working ok (new). have cleared a blockage from the cold feed.
rads upstairs heating ok but downstairs stone cold. I am getting water to all the rads,
Can one of you wise gents please help. thank you.

 

[PhoenixServices]

Sure the pump is spinning. Stick a screwdriver in to see if it stops. Failing that turn upstairs rads off to push air out of the downstairs rads.

 

[SimonG]

Welcome to the forum

Sounds like a circulation problem. Upstairs will heat via convection whilst downstairs remains cold.

Try turning all rads off except for one downstairs.

What size pipework do you have?

 

[roylufc]

pump is a new one and working fine, have tried all 3 speeds. have tried shutting down upstairs rads, still nothing. am getting water to all rads downstairs. thanks for the reply by the way. if i had hair i would have pulled it out by now..

 

[roylufc]

it is a very old system, the pipework to the rads is 15mm

 

[roylufc]

have tried that, no joy. thanks for the help tho

 

[PriestyUK]

The pump is pumping the correct way isnt it? :S