Cold Rads Downstairs Hot Upstairs

VinceW

Is anyone able to help

Symtoms: Cold Rads downstairs(stone cold) - Hot upstairs

Back Boiler not sure what type

Gravity fed hot Water and pumped CH

Pump has been replaced and is spinning

No air in downstairs rads water comes out of bleed valve when opened.

It has been suggested the injector tee could be problematic if the pump is running too fast????

There is water in F & E tank

If timer set to CH only and demand made for CH
pump spins up.

Down stairs rads appear to be supplied from two different points upstairs

Any thoughts greatly appreciated....

Bjd

You have me a little confused, as to what type of system you have.
Is it gravity or monoflow?

What is CH?

bjd