cold rads after taking them off an flushing

[pastashell]

Good evening
I have had my rads off and flushed them out side with the hose , connected them all back up and refilled the system. It is a cylinder withe the header tank combined . all but 2 rads are now getting hot . I have bled them all and water comes out albeit cold on the ones that art warming up . Any help greatly appreciated

 

[terryplumb]

Close the TRV ( or wheel head valve) on all the working radiators,don't touch their lockshields,and see if problem rads now heat up.
If your boiler heats the domestic hot water in your cylinder ,set programmer for central heating only.

 

[pastashell]

ill try now 2 are towel rails just close one end ?

 

[terryplumb]

ill try now 2 are towel rails just close one end ?

Yes ,make a note of how many turns it takes to close ,so can be returned to original positions

 

[pastashell]

ok dokie

 

[pastashell]

nothing seems to be occurring ,should I drop all the system again tomorrow ? is there a correct procedure in doing this ? I've done it numerous times before and not had any issues

 

[terryplumb]

Is boiler running ? The heat it's generating must go somewhere ,or boiler will close down ?

 

[pastashell]

yes boiler running and both pumps

 

[terryplumb]

Why have you got 2 pumps ?
Is boiler actually firing up ,burning gas ? Did problem rads previously work ?

 

[pastashell]

one for cylinder one for rads I presume its an all in one type cylinde,r boiler is running yes fired up burning gas

 

[pastashell]

yes all rads worked before

 

[terryplumb]

Sorry ,not with you ?

one for cylinder one for rads I presume its an all in one type cylinde,r boiler is running yes fired up burning gas

What boiler do you have ?
Is boiler fed from a loft tank ?
Dont know why the hot water cylinder has a seperate pump can you show pics ?
Are the working rads still heating up or cooling down ?

 

[pastashell]

Yayyyyyy a massive fat gurgle and things seem to be getting warm

 

[pastashell]

What was the cause ? an air lock ? Thank you so much my kids will return to pink from blue lol

 

[terryplumb]

What was the cause ? an air lock ? Thank you so much my kids will return to pink from blue lol

Yes , undoubtedly an air lock ,pocket of air trapped in pipework.