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  1. O

    Vaillant eco tec pro 428 with VR66, VRT350 (ebus) and Vr10

    FIXED. I looked at D70, it was set to 0 i reset it to 2 then back to 1 the DHT came on and the system is now working well. Thanks for your help.
  2. O

    Vaillant eco tec pro 428 with VR66, VRT350 (ebus) and Vr10

    Ok, Thanks but this will have to wait untill the morning, Am i correct in thinking i need to set D70 to 0??
  3. O

    Vaillant eco tec pro 428 with VR66, VRT350 (ebus) and Vr10

    I have No idea, what do i do to find and read this value
  4. O

    Vaillant eco tec pro 428 with VR66, VRT350 (ebus) and Vr10

    I have an eco tec 428 boiler running in sealed system with VR66 VRT350 wired and A VR10 NTC sensor, System runs well in central heating mode but i cannot call DHW VRT timer is set so that DHW is on, VRT350 shows hot water temp in installer menu and boiler off during DHW demand time and HEATING...
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