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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
Saunier DuvalHeating, Home Heating SystemsCentral Heating Hot Water Working Fine
boiler pump

tony
April 2008

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