ebus module with wifi, no eBUS signal

[HT-Code]

Hello,
I just purchased a module with the esp-ebus Version 6.3.
I have the module connected to a Vaillant Eco Tec plus combi heater.

I'm able to connect with the web GUI of the module via the browser and I receive MQTT messages (eg module temperature and rssi values). However I'm not able to get the eBUS communication running.
The status tab reports:
ebusd connected: yes (inactive)
eBUS signal: no signal

and in the logging I get 1 warning:
Warning execute: command failed: var -q stick = 1

I tried several configuration option but without success.

[HT-Code]

Seems the eBUS is not working at all.
Any body an idea what is wrong here?

[jjfoid]

I have the eBUS Adapter Shield C6, and it works out of the box in terms of acquiring the eBUS signal. I've just connected eBUS contacts of my heater with eBUS contacts of the board (+/- doesn't matter), and it started to show the following at the adapter's web UI (easi):

eBUS signal: acquired

I recommend checking wiring from the adapter to the heater's board (at the board side, it should be connected to the proper BUS contacts - i.e. BUS contacts of X106 contactor) to ensure you've connected wires correctly.
No other ideas, to be honest. I don't think eBus can be switched off on this heater.

[HT-Code]

Thank you for the information jjfoid,
I checked the voltage level on the eBUS pins: Vdc = 22V and varying from 21V to 22.5V. Variation on the voltage level is most likely caused by the data on the eBUS as I see the "data" LED blinking irregularly.
In the eBUS adapter shield GUI I see that the module is connected via wifi/MQTT (Chip id: ccba9764e81c, ESP-32-c3, rev 4).
On the internet I see regularly that these modules are dead on arrival.
Does anybody have the same experience?

[john30]

@HT-Code "Version 6.3" is not something that fits to any of my adapters. Consequently using my firmware on that wouldn't work in the first place

[HT-Code]

Clear, thanks for the information John.
I'll try another module