by htg engineer »
Sun Jun 17, 2007 11:22 am
probably air locked, get a cutting of hose pipe about 2 foot long. Open hot tap and place hose pipe over the end then place hose pipe over the end of cold water tap and open the tap. This will backfill the hot water pipes and clear any airlocks. Hope this helps.
May need to try this a few times to clear the airlock.