Bleeding radiators not working...

silverliningmummy

Hi everyone. I'm looking for a bit of advice please. I noticed last night that the radiators upstairs (3 radiators) are all cold at the top and hot at the bottom when the central heating is on.

I've bled them this morning and on two there was a tiny hiss but nothing on the third and none of them dripped any water at all.

could it be a bigger problem than just needing to bleed them and if so, does anyone have any advise on what I could do to sort it.

Thanks

DVardysShadow

Combi boiler? The system needs topping up via the filling loop.

Conventional boiler with vented system? Maybe the header tank is frozen up?

WestonDave

As above - check the pressure on the boiler if its a combi - if the pressure is too low and it needs topping up, you won't get anything out via bleeding as you need th pressure to push the air out. If its low, top it up (as per the manual), bleed the radiators and then you'll probably need to top it up again as you'll have lost pressure by letting air out.