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How can I fix the instant water heating on my vaillant vcw-sine 18 T3WF H?

The central heating works. The immersion heating works when the immersion/instant switch is switched to Immersion but when that switch is switched to instant water heating nothing happens and taps just run cold. It doesn'e fire up to heat and supply water.

Tony v
February 2009
VaillantHeating, Home Heating SystemsWater Central Works

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