air lock

[mark anthony]

I have just fitted an extra radiator to my central heating system, after refilling & bleeding all the rads, only the rad in the bathroom gets hot, i have an open vent syster with a vallent 415 boiler with a copper tank back up, i have tride to blead the cerculation pump but nothing happened???????????

 

[welly2510]

turn rads of leaving just one open at a time, go round all of them one by one then turn pump off and bleed again, if its just airlocked it will normally push it through.

 

[Billy Bob Bob]

have you got water in the system? cold feed may be blocked

 

[mark anthony]

I tride shuting them of & runing one at a time but no joy, only the bathroom one works upstairs & 2 down stairs, the sistem if filling ok from the mini tank in the loft, i have also bled the valve in the loft, i even tride ataching a hose to a rad downstairs & back flushing but this made no diferance.

 

[dontknowitall]

Try bleeding the pump. Have a towel ready and undo the large screw at the front and if an egg cup full (approx) of water comes out then it's bled.

 

[mark anthony]

Dun that but it just drips out?

 

[dontknowitall]

That's okay - it can happen that the air lock (if there is one) is around the pump area. If there was an air lock there then no water would have come out!