no central heating but hot water working fine?
hi i have a saunier duval 30 e combi boiler.my hot water is fine but my central heating isnt working .there is like a build up of pressure then it knocks the heating of this is about 15 seconds after turning the heating on.There is also like a ticking sound when the heating is turned on. The red lockout light has come on once as well.Any ideas on what the problem might be.
Allan Hay, April 2008
