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F22 fault Vaillant ecoTec pro – HELP

You may get a F22 message on the boiler from time to time, when this happens you will have no heating or hot water. This is not usually a boiler fault but is because the central heating system (radiators, valves and pipework) have lost some pressure (water). It is nothing to be concerned about unless it happens regularly. Many systems will need “topping up” 3 or 4 times a year. Adding pressure is very simple and is a task most home…...
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