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Hi, does anybody know what the fault code F4 means? Thanks

I'm studying for my ccn1 and need help with a question. Theres no-one else I can ask at the moment and its driving me mad. What is the likely fault if a cooker oven burner extinguished after approx 15 minutes? a/ faulty FSD b/ blocked oven injectors c/ blocked oven thermostat by pass d/...

Have just installed a new cylinder but, after refilling,have found that the hot water doesn't get hot. Central heating works ok. When hot water is switched on, boiler fires for a few minutes then shuts down. There is no cylinder stat and I can't find any motorised valves :roll: Any ideas...