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Mend Ravenheat 85 Boiler Combi Heating

combi boiler, ravenheat 85 condensing?

When i put the heating on, the boiler fires and goes off repeatedly every few seconds (rads get warm but not as hot as they did though) but if i turn on hot tap the boiler fires and stays fired until tap turned off, and then stays fired longer for heating, and rads get hotter. Any idea why.

Stut
October 2010
RavenheatRavenheat 85Heating, Home Heating SystemsBoiler Combi Heating

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Ravenheat 85 Boiler: Firing & Cutting Out - Help!