How to mend Ravenheat Ls 80 Combi

how to fix combi boiler problem?

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heating cuting out after its run for sort time?

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ravenheat Combi Boiler,?

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Ravenheat CSI 85 Red Light?

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Ravenheat boiler ( ye i know there s*&%e )?

How to fix pressure drops- Ravenheat CSI 85 (T) 780 ?