Same response in ebusd but different values in vaillant heat-pump

[MichaelLachmann]

Hi,

I'm new here and started connecting to my Vaillant heat pump (arotherm vwl 55/6) with a multimatic 700.
I've build an adapter from that schematics: https://github.com/slavikb/BaiMon/blob/master/EBus-adapter.pdf
I used a Wemos D1 Mini (ESP8266) as controller where I installed the latest ebusd-esp.

I believe the adapter is working fine as ebusd delivery consistant results - even after longer periods of time.

I've tried to read sensor values from VWZ Test Menu (query to WP entries Installer level/Test Menu/Sensor test) and went through all possible values.

Than I started analysing the log and I found all my queried values in the log.

But now the strange thing:
There are some values where I saw different temperature values on the display but in the log the value just shows 22fc.

Some examples:
2023-07-19 12:49:33.388 [update notice] received unknown MS cmd: 7108b51405053003ffff / 0430003801
here the display showed 31,2° which is matching with the hex value 3801.

2023-07-19 18:34:13.349 [update notice] received unknown MS cmd: 7108b51405052903ffff / 04290022fc
2023-07-19 18:34:22.799 [update notice] received unknown MS cmd: 7108b51405052c03ffff / 042c0022fc
these two where displayed with 18,1 and 47,9°.
But looking at the result value that is impossible.

One side node:
When running through the sensor values, the display show either 0.xx or 1.xx where xx are unique no matter of prefixed with 0 or one ... thus i'm not confused that that command values do not represent the 0 or 1 group.
However the value problem exists only for the values in group 1.xx

Would you have an idea what is going on here?
Thank you for your help.

Best regards,
Michael