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  1. J

    Vaillant VR66 wiring control centre causing heating modulation woes?

    guys I have some questions regarding modulation: are we absolutely sure that by "modulation" is meant modulation of flow temperature during one cycle or only modulation of flame power output once it reaches eBus target? or different flow temperatures in different cycles (eBus targets changes...
  2. J

    Vaillant VR66 wiring control centre causing heating modulation woes?

    Hi Matthew B, I continued this same conversation on the other topic you started but found you here. I had the same problem as you have until month ago when I just forced heat curve down to unrealistic 0.6 and thats the first time when flow temp reacted to heat curve adjustment (and it lowered...
  3. J

    Vaillant vSmart - Any experts out there?

    Matt, have you been able to solve the problem this autumn? if yes would you be so kind to share it with me since I have the same problem
  4. J

    Vaillant vSmart - Any experts out there?

    Matthew, when i read your first post i thought I wrote it. After that I read the whole conversation. You have an identical problem that I have. I am from Croatia. I bought an Eco TEC 386 (or something like that, 38kW max power) in February 2020 and when it was set up everything worked great...
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