Nefit EcomLine HR43 not correctly detecting the bus signal

[Victor-Mo]

@iamceph I moved the issues to this detect because it is a different setup then the original issue.

If I look at the first data you posted (in tx_mode 4):

(00:04:55.494) irt_rawTelegram: 01: 00
(00:04:56.674) irt_rawTelegram: 18: 01 01 FC 07 FF 00 FF F2 07 29 45 58 73 52 25 43 78 07 FF A1 82 00 91 F4

This look like it almost detected the correct signal but it is missing some bits. So my first question is, what thermostat are you using and what is the length between the thermostat and the boiler. This may be resolved by increasing the 1,5 MOhm resistor to a higher value.

The second test you did, with tx_mode 5, is a bit strange. Because I can see the boiler sending the polling messages (the 00, 01, 02 and 03) data. But I do not see the interface transmitting anything. Because it logs the msg to transmit before sending it. What interface board are you using ? A pre-modified board or did you build it yourself ?

The third test you did, tx_mode 5 and the thermostat connected will not work, because the iRT cannot handle two active devices.

[iamceph]

Thank you.

1. The thermostat is Nefit ModuLine III, distance is +- 4-5 meters. (It is just in the next floor, above the boiler.)
2. I am using modified interface from BBQKees, I did nothing to it.
3. Okay!

[iamceph]

I also had an idea to move the interface to the place where thermostat currently is, is that good?

[Victor-Mo]

@iamceph Just give it a try. I also have the interface around 5 a 6 meters from the boiler. I think it will improve the signal because there will be more voltage drop across the wires.

[iamceph]

Tried it, with same result sadly :/

[Victor-Mo]

Did you try tx_mode 4 with the thermostat connected ?