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Please can someone help me!! We purchased 1 year agao a Viesmann Vitodens 100 Combi Boiler and have had major problems with the flow switch sticking. We have had 3 sub contractors come out and replace the flow switch and a Viesmann engineer come out very recently blaming the water for the problem with the flow switch!! Their are around 70% of combi boilers sold throughout the uk and water is a big part of a boiler working, we also found out that we should have a filter fitted to the main supply to prevent any debris/particles getting in to cause the flow switch to stick. My view on this quite frankly is why on earth manufacture a boiler so highly sensitive to grit or particles, I also asked the question of the possibility of the model being faulty but was told definately not its a water issue. I would like to hear from someone who has an unbiased view Regards Simon Cooper

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I am pleased to suggest that you try to following. i would wager that the switch is installed in the horizontal position. try replumbing so that the switch or valve is verticle to the ground. . that way particles will settle down with water flow and not be eating up the gaskets on the valve. in other words flow side to side leaves debris in the valve when it seats. . installed in a vertical position the valve flushes itself as it seats. good luck let me know what happens.

Posted on Nov 01, 2008

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