1. jakub742

    Viessmann Vitopend 100-W WH1B heating not working. (Hot water in taps is fine)

    For some reason my boiler stopped heating the radiators, hot water running fine. A month ago when it happened i kinda played around with pressure, i drained few liters of water so it would be at 0, then put pressure to 1 it worked for 3 weeks, then happened again same trick didnt helped. I...
  2. jakub742

    Viessmann Vitopend 100-W WH1B thermostat replacement

    Hi I bought MH1823 TuYa Smart Wifi Thermostat and i'm wondering how to connect it to my boiler. Current thermostat wiring: Vitopend schema: I didnt check the cables inside the boiler, i'm not a professional just wondering if its possible. My current thermostat has only No and COM cables...