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DHW?

I have a vaillant turbomax the central heating workes ok but when I call for hot water the burner goes on the temperature rises to 80c then the burner goes out the temperature drops then the boiler lights again and so on the water goes hot cold hot cold
derick vellosa, February 2009
You have sludge in plate DHW heatexchanger
De scale it may be use of power flush or remove and descale it outside

Mr K, February 2009
link Click here to see other fixes for Vaillant.