First of all, I'm sorry but I've to write this in english as my german isn't good enough. I recently acquired a house in France equipped with a Vitodens 300-W but the main thermostat of the house was gone. I replaced it with a wireless tado thermostat (a professional electrician installed it on the 300-W) and have installed tado thermostatic heads on every single radiator that I have. But now everytime I raise the heating, the 300-W heats until 40°C ish then I have the error code C5. I did like I've seen on this forum and changed the programming code 2 - 30:2 to 30:0 and then it works. The issue is that the programming goes back to 30:2 after a couple of hours ( and it changes back every day), so I've to go and change it pretty much each time I need some heat. Does anyone know why it goes back to 30:2 ? Is there a way to make it stay at 30:0 ? Could it be because there is some daily programming into the 300-W and the programming code changes for each time slot ? Thanks in advance, Pierre
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