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Hi, My Vailant boiler regularly comes up with F22. When I turn it off and on, it clears it and the hot water starts again. It appears to occur when you run a hot water tap slightly open. Boiler pressure etc is OK. This has been the case for a few years, it is nuisance especially first thing...

I have a Vaillant 828/2E turbo max plus boiler and it has worked okay for nearly two years. Since recently the hotwater temperature on the taps keeps going hot and cold. It appears the boiler heats and cuts off and fires up when the temperature drops. I have changed the NTC sensors one at a...