On Tue, 27 Dec 2016 15:59:02 +0000, Phil L wrote:

nicola wrote:
help, my gloworm combi boiler is heating my water but not heating the
radiators,
i have bled all rads incase air lock but from the middle floor to top
floor there is nothing coming out of the ras, no air or water. any
ideas?

The system has no pressure if there's nothing coming out of the rads.


If there is no pressure, there will be no hot water either.
Another poster says the header tank needs filling! Why even reply if you
havent got any idea about these things?
It is a combi boiler, it will be pressurised, it has hot water, but no
radiators.
It could be a few things, but my money would be on a stuck diverter
valve. Other areas to check would be sensors on the CH outputs, or even a
PCB failure, a pump that is failing, but working enough to pump the HW
around the boiler, a fault with the programmer/stat, or even a total
blockage on the CH pipes.

Do any of the CH output pipes get hotter when calling for heat?
Is there a crucnching/sticking noise when the diverter valve moves/tries
to move?
Does the boiler fire up at all when calling for heat?

Check the boiler is getting an input from the programmer/stat.
Take the cover off to see / hear if the diverter is moving.
It is fires up, see how long for, and of the output pipes get hot, and
if / when it cuts out.

Get someone in who knows what they are doing.