What the manual says
Manufacturer manualMaximum flow temperature °C
From this model's manual
Verified against the Vaillant Turbomax Plus installation & service manual, page 39.
DIY fix possible
Press the 'i' button on your boiler display to toggle back to the standard operating viewCheck your thermostat settings to ensure the heating is set to your preferred temperatureMonitor the boiler for any actual error codes appearing in the future
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