How to mend Ravenheat Ls80/ls100

pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?

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Central heating but no hot water?

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heating cuting out after its run for sort time?

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ravenheat csi85 goes to lockout?

ravenheat Combi Boiler,?

ravenheat csi 85 cuts out restarts every minute ?

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

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i have full central heating but no hot water. a classic rxrs?

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