by htg engineer »
Sun Apr 06, 2008 10:16 am
Do you know where the pump is ?
Check there's an electrical supply to it,
turn up a speed,
open the vant to let any air escape,
If the pump feels hot - then it may be stuck - give it a tap with a hamer and see if it frees it.
Was the pump left running when the heating was drained ? could have burnt out
Could just be air in the pump from when you drained all or part of the system.