I have a problem with the Vaillant ecoTEC pro VUW 246/5-3 gas boiler. The boiler is paired with an Vaillant eRELAX/vSMART thermostat/application, and I have floor heating. Until recently, everything worked as it should, but now the floor heating no longer works. Hot tap water still works perfectly.
What happens is that whenever I turn on floor heating, boiler starts heating, temperature raises to around 35 °C (I have set max temperature for floor heating at 55 °C), and after temperature reaches around 35 °C, hourglass symbol appears, starts blinking, and boiler stops heating. Boiler is not in summer mode.
I turned off the power for a few minutes from gateway, changed batteries in thermostat, reconnected everything, restarted boiler few times on the button. Issue persists. Hot tap water works, but hourglass symbol appears after a few minutes when I turn on floor heating. If you can help me troubleshoot further, it would be highly appreciated.
What happens is that whenever I turn on floor heating, boiler starts heating, temperature raises to around 35 °C (I have set max temperature for floor heating at 55 °C), and after temperature reaches around 35 °C, hourglass symbol appears, starts blinking, and boiler stops heating. Boiler is not in summer mode.
I turned off the power for a few minutes from gateway, changed batteries in thermostat, reconnected everything, restarted boiler few times on the button. Issue persists. Hot tap water works, but hourglass symbol appears after a few minutes when I turn on floor heating. If you can help me troubleshoot further, it would be highly appreciated.