"Peter Kemp" wrote in message
om...
Wow - some really helpful input and suggestions: much obliged.

I've re-bled all the radiators in the system. Each one now spits water
the instant I turn the bleed valve, including the recalcitrant beastie,
so I guess I can't blame an airlock.

Time for a slightly more 'assertive' approach, methinks...


Thanks everyone,
Peter

The last time I came across this the lockshield valve was broken. It felt as
if it was opening and closing but internally the valve had snapped and it
was sat in the closed position.

Adam