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    Vaillant VR65 eBUS output drop to 1.9v

    Hello, I have a Vaillant EcoTEC plus624 boiler (2010 model), a Vaillant VRT392 thermostat, and a UniSTOR hot water storage cylinder connected to a Vaillant VR65 control center, now the problem is the VRT 392 suddenly stopped working which is completely dead, althrough I still have hot water but...