vaillant 630

  1. W

    Vaillant ecoTec Plus 630 boiler not reaching target temp

    I recently had a new 2023 Vaillant ecoTec plus 630 (30kW) system boiler installed along with a Low Loss Header (LLH) in my house. I have 21 rads in the house and a room with UFH. The LLH was introduced as I was finding (before the LLH was fitted) that my old boiler (Vaillant heat-only boiler)...
  2. J

    vaillant ecotec plus 630 hot water issue

    I have a vaillant ecotec plus 630 boiler. The hot water is not working correctly. Sometimes HW will come on when programmed but not always. HW does come on when the heating and hot water are both programmed to be on. HW is now coming on when the Heating is on but HW should be off. I can...
  3. N

    Vaillant EcoTec 630 plus boiler turns on for central heating but not providing domestic hot water

    After the last few days of warm weather, the CH thermostat never triggered the boiler to turn on, and now the DHW temperature has dropped. I can't seem to get the boiler to turn on for DHW. The boiler only shows the CH radiator symbol on the right, and no DHW tap symbol on the left. From...
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