My boiler (and entire central heating system) was installed and first used in August 2009. In February 2011 the hot water began fluctuating hot and cold. The boiler still under warranty was repaired by Viessmann with a new heat exchange plate which was blocked with sludge. They replaced this part under warranty and the system worked correctly again. Until now, when the same fault has re-occurred. They are now saying if they come back and find the same problem , then I will be liable to a call out charge and they would not replace the part under warranty. At no point when they replaced the heat exchange plate in February did they recommend I take any 'preventative actions' (for example, flushing the system). I removed three radiators in the summer to decorate behind and each drained clear to begin with then black toward the end. The system has always had a MagnaClean filter installed. I don't understand why this problem has re-occurred and I am annoyed that the system may require flushing to clear out the debris. Does anyone think the entire system may not have been treated properly when it was installed? Also, if the system were to to flushed, would this clear the problem within the boiler without replacing any parts? I'd really appreciate any professional insight into this before I call the boiler company again.... Thanks
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