thanx for reply..i have checked header and there seems to be plenty of water in it.
Boiler is a very old IDEAL VULCAN RS55 FLOOR STANDING DOWNSTAIRS BOILER.
Tank is upstairs in bathroom.
Not sure where to look next..Zone valve is next to pump wich is next to tank.
Once again any help would be great.
Thanx
Gez
GEZ
October 2009