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Dear Flo_Schneider,   The E81 error is displayed on the Vitotronic (Black Electronic module  with LCD display on the Heat Pump). Can you share with me the meaning of this error? Best regards, ... Mehr anzeigen

Dear Flo_Schneider, Thank you for your confirmation of No compliant NC Box assembly. Can you share with me the correct draw assembly for NC Box + Buffer link to Heat Pump? By the way, in such configuration (Heating mode), after few hours of heating, an error occured. E81. Can you give more information regarding this Error code? I do not understand why the heat pump do not follow the regulation under water law. CC1 and CC2 have for each one a similiar regulation law.   Best regards, PA ... Mehr anzeigen

I just found this scheme. But i did not find the scheme including NC Box has i decided to add it after the first discussion. By the way, the  NC Box is located before the buffer cylinder. That's why when the NC Box start i need to have the underfloor heat pump starting too. So it's not possible to have this configuration  for Cooling Mode (same way of working has Heat Mode)? ... Mehr anzeigen

Correct, Heating and Cooling via Buffer Tank.  - For Heating mode, Compressor start and underfloor heating pump start too. - For Cooling mode, NC Box start but underfloor heating pump do not start.   Best regards,  PA ... Mehr anzeigen

Dear Flo,   7100 parameter is "1"   The NC Box starts correctly but not the underfloor heating pump.   Best regards, PA ... Mehr anzeigen

Dear Flo_Schneider   I think i have the same issue as Jörgi. My installation is a VITOCAL 300G + NC Box (only heat exchanger and two two-way valves) connected to Buffer Balloon. Connected to this buffer Balloon i have the radiator circuit and the underfloor heating circuit. In heating mode, the Heat Pump heats the water in the tank and starts the underfloor heating pump. However, in cooling mode, the NC Box starts but not the underfloor heating pump. What should I do to get the pump to start?   My Vitocal Serial Number: 7377453401077122 How can i solve the issue in order to start the underfloor heating circuit when the NC Box start?   Best regards PA ... Mehr anzeigen