Help me please - no hot radiators at all

[MickyDo]

Can anybody help me with the problem of all my radiators running cold !
I have a worcester 24cdi boiler and as my rads have been going cooler over a period of about a year i decided to change them and also all the valves as i suspected them of being bunged up with gunge. However the result is that they are all now stone cold and only cold water comes out when i bleed them. The boiler which is in the garage fires up fine but i have noticed that the infeed pipe which runs through the wall into the house gets hot very very slowly (takes 15 mins for a run of about 30 feet to get hot). Does the system just need balancing or is there a bigger problem ?
ANY HELP APPRECIATED

 

[Agile]

Is the GHW perfect?

Valves on boiler closed or jammed or pipework blocked?

Tony

 

[MickyDo]

Hi Tony, thanks for the quick reply. Did you mean DHW, if so then the domestic hot water is ok but i do have to turn the pressure down on the taps to get piping hot water ! As for a blockage in the pipes i can't really tell but i know that when i drain the system and refill it again i can hear water entering all of the rads so i would have thougt that if there was a blockage the rads wouldn't fill up. I thought it might have been a faulty pump so i replaced it with a new one last week.