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Central heating is okay, just no domestic hot water - taps dry. Is it air lock? Why does boiler lose its pressure - fault F22 each day this week? Not good for new boiler. :(

Help, new boiler Valliant ecotec 837 fitted in October. Three times recently fault F22, opened valves to pressurise boiler fires up for heating but no hot water - dry. Is this air lock? What can I do, engineer not available until Monday. Installer not replying