Solved: Vitocal300 WO1B does not start with VitoWifi attached

[s0170071]

Solved: Vitocal300 WO1B does not start with VitoWifi attached

[s0170071]

The thing is that when the Vitotronic starts, it listens for communication. If it sees any, it goes into some bootloader mode. I did not investigate this further as the solution is to just don't talk to it when it restarts. Seems like your're better off not hooking the ESP up to the backup supply.
In fact, I hooked mine up to the internal switch of the Vitotronic so that it gets rebooted when I switch on the heater.

I did this because my wife would hate me if the heating fails and cannot be restarted while I am away...

The only alternative that I can think of is that you monitor the heater power supply with your ESP.

[bertmelis]

I remember suffering this issue too. There's no real bullet-proof solution. If your ESP is on mains power (same circuit as the heater?), you could add a delay before VitoWiFi starts listening and hope your heater has booted meanwhile.

PS I recently moved back to a house with a Viessmann heater so I'm planning to support more actively again. I have yet to build a module before I can start though.

[bertmelis]

Closing. This has to be taken care of by the implementation.

[novaktom]

@s0170071 I have ESP on battery backup, but not Vitocal unit. In case of power outage ESP does not restart, so setup() would not help. Don't you know how to solve that please? Restart ESP periodically? Or close (0x04) and initialize communication periodically (every 5 min or so)?