grundfos upm3

  1. B

    Veissmann Vitodens 111 failing to send hot water to Underfloor Heating

    Can anyone help? We installed a brand new Veissman Vitodens 111 and underfloor heating system (Ambiente Manifold, Grundfos ump3 auto pump, and Heatmiser Controls) 18 months ago. We've had no issues at the tail end of winter 2022 and all of winter 2023; but when things switched on this week its...
  2. M

    38CDI: doesn't fire on heat demand, and Grundfos UPM3 stuck

    The cold snap made me switch heating on for first time in 6 months which has caused 2 unrelated problems on a well maintained Worcester Bosch 38CDI. Grateful for any advice on: 1) boiler doesn't respond to Nest thermostat 1's call for heat, either wirelessly or on manual override next to the...
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