Problem with One Radiator which keeps filling up with Air

[SWE]

I have got a problem with only 1 Radiator. It keeps filling up with Air and needs to be bleed. Its the radiator which is nearest to the airing cupboard. In the airing cupboard there is 2 2 port valves, pump and By pass Valve and Cylinder. Anyone got any idea's what could be causing the problem. The system is open vented.

 

[Whyme]

its usually due to vent configuration or pumping over aerating the water..Do you ever hear water trickling in the loft when the boilers running?

 

[SimonG]

Sure its air and not hydrogen? Hydrogen would signify corrosion.

 

[PlumbBobBob]

Sure its air and not hydrogen? Hydrogen would signify corrosion.

+1 for it being possibly hydrogen

 

[SWE]

its usually due to vent configuration or pumping over aerating the water..Do you ever hear water trickling in the loft when the boilers running?

I will go into the loft when the boiler is running and check it out.

 

[SWE]

+1 for it being possibly hydrogen

All the radiators on the 1st floor were fitted at the same time. If it was corrosion surely there would be more than 1 rad filling up with Hyrogen. Advice appreciated.

 

[MC_Bob]

Not if that rad has the corrosion occuring.
Someone may correct me but I think you can hold a cup upside down over the vent as you bleed it. Light a match and put it under into the cup and if it squeeks its hydrogen.

More than likely though its the first rad on the htg circuit and its drawing air from the loft.

 

[PlumbBobBob]

Someone may correct me but I think you can hold a cup upside down over the vent as you bleed it. Light a match and put it under into the cup and if it squeeks its hydrogen.

yes just like that

 

[helpsy]

Watch out for the curtains!

 

[happyflyer]

+1 for it being possibly hydrogen

Only one way to find out, take 2 mins and burnt finger and thumb