Radiators wont fill?

[mandsandadam]

I wanted to put some cleaning solution in my radiators and the boiler had been banging and knocking on and off for some time now, i have bled all the water out of the system and have refilled the header tank, but now cannot get water back into the radiators, when i open the bleed valves there is nothing, no hissing or air movement and no water in any of the radiators. I have a grundfos pump installed, do i have to run the boiler to get the pump to allow water through? I really know nothing about this kind of thing but thought it would be simple enough to do. Help!!

Oh I forgot to say there was difficulty in emptying the header tank and it was syphoned out but later the "missing" water did bleed out of the radiators, or so we thought.

 

[YELLERBELLY]

sounds like a classic blocked feed

 

[45yearsagasman]

Blocked cold feed pipe.From the header tank follow the 15mm outlet pipe to where it connects to the system and there will be your blockage.

 

[bengasman]

It's probably past a simple clean, but you could try back filling the system to give it a try.

 

[mandsandadam]

Thanks for replies, is really, really appreciated. How would I know where the 15mm outlet pipe connects to the system? How do I know if my pump is broken? Am so stupid I know...

 

[Hugh Jaleak]

45yearsagasman: From the header tank follow the 15mm outlet pipe to where it connects to the system

Already got the answer! This section will need cutting out and replacing. Get some water in the system before trying the pump. (Otherwise you'll be condemning the boiler. Or worse, yourself.)

 

[75pete]

You could always try FAQ 12. It may get you out of trouble.
pete