Blocked System

[tadleymansions]

Hi
It all started when I re-connected a radiator that had been out of the system for some time.
When I bled the radiator all seemed ok.
Then the system stopped and all went cold. I have checked programmer, boiler, roomstat and tankstat and all function as they should.
Suspected an air lock so I drained the system.
It would appear that there is a blockage somewhere as the header tank has not emptied so I cannot re-fill the system.
I'm a bit stumped as how to proceed.
HELP!

John

 

[Phil]

I would connect a hose pipe to the lowest drain point with a hose clip and temporarly plug the open vent over the small F & E tank, the mains pressure cold water will hopefuly blow the blockage or airlock back into the tank.

These systems can block the magnatite where the F & E tee's into the system, see if a magnet stick to it, if it does then there's the blockage there.

You need to bleed the rads, pump and any other vents points in the airing cupboard.

 

[tadleymansions]

Thanks Phil.

Sorry - finger trouble.
Thanks Phil.
Should I be turning the rads off at both ends before trying to back flush? Or doesn't it matter?

John