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    Vailant VCW Sine 18 T3W heating can only be switched off with the Control switch on the panel, even with the thermostat removed.

    I am new to this forum. I am an electronic engineer, but I have a problem with my dad's VCW Sine 18 T3W. Over the years I have fixed the PCB and many other problems as well as a new pump, diaphragms, pins, and motor run capacitors in the pump. It has been a great boiler and is still working well...
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