Junkers Boiler - Simulated Remote FB10 - Feature "disable on missing temperature" sets RoomTemperature to -76.8°C

[bergteam]

DESCRIPTION

A Junkers Boiler with FW120 and EMS-ESP is setup to simulate an FB10. This is working fine.

There is an issue with the feature DeactivateRemoteOnMissingRoomTemperatur.

Steps to Reproduce

1. WebGui => Settings=>Applicaton => DeactivateRemoteOnMissingRoomTemperatur was enabled.
2. Room sensor did not change the temperature for the time set in (1)
3. EMS-ESP now
   • sets the RoomTemperature to -76.8°C (reproducible the same value)
   • does not remove FB10 in the view of the heating system - the thermostat FW120 displays error 12 (bus client is missing)
     and still shows FB10 temperature
   • FB10 was removed from EMS-ESP devices - good

Screenshots

Display in EMS-ESP

Display on FW120

EXPECTED BEHAVIOUR

I'm not sure. Maybee disable FB10 (which works be manually sending -1 to "hc1 room temperature from remote") and set temperature to FW120 internal temperature.

SOFTWARE/HARDWARE

Heating System
Type Name Device ID Product ID
Boiler CBS/GB*72, Trendline, Cerapur, Greenstar Si 0x08 123
Thermostat FW120 0x10 192
Thermostat FB10 0x18 109
Solar Module ISM1 0x30 101

ESP
Version 3.7.2-dev.11
Platform ESP32-16MB (-PSRAM)
Release Type Development

[MichaelDvP]

Switch off sends a single 0x7F00 as temperature, the code for no sensor. -76.8°C is 0xFD00, don't know why the higghest bit is set and what code this is.

As long as the master thermostat is set to control FB10, you will get an error message. That's by design. I think the FW120 sets this temperature to make sure that the room is heated.

[bergteam]

Maybee this can be updated in the documentation. I was afraid of keeping the boiler with -76.8°C room temperature reading.

In fact, everything behaves as expected in this situation. Boiler heats according to outside temperature and calculates heating power fine.