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Sorry, I moved to another GW (GW to ModBus) and resolved my problem.

Thanks a lot for your efforts!
12=04
65=00
66=00
06=DE

OK, if your theory confirms why does it recover from this state by shorting of X1?

If I place a wire across contacts of X1 terminal OTGW communicate with boiler without any issues. At least for 14 days. It is not a solution for my task because I cannot manage it in such mode. But technically communication works well. I do reset by removing of power and then reapplying it. It reall...

Thanks a lot for your assistance! OTGW works fine for a long period of time if X1 is shorted. And it works for a few hours or until the first power reset when X1 is opened. I had removed a jumper over X1 and made a test. Before reboot (power disconnect) registers had following data: 7E = 20 57 = 70-...

As I reported previously it losts a communication over OT after some hours of working or restart. If the X1 is shorted there is no such behavior. I will be very glad if you can help me to resolve this issue and make it works without X1 shorting. I already reimaged it for a few times with the latest ...

I've checked everything from the troubleshooting section you mentioned and didn't a problem there. I talked with other user of OTGW and he confirmed that it not works without shorted X1. My symptoms: after a few days of normal functioning it lost any communication with boiler. When I short X1 for a ...

The boiler stops answer without any reason, the OTGW stops sending without any reason. But closing of X1 they start normal communication.
I need to understand what to replace: OTWG or boiler PCB.

I use OTG in stand-alone working mode. Without thermostat with boiler of Thermona. Everything worked well for a few months but few days ago after some hours of work or after power outage OTG stops communication with boiler. The same with GW=R command. 10:17:35.314614 OpenTherm Gateway 4.2.5 10:17:35...

I have changed the cable, connected the ground wire.
I'm not sure that it finally resolved a problem but now it seems that it works fine.

I have a problem with my OTG on serial interface (without any converters). After restart it works fine for some time (maybe hours) and then it only send data but don't receive anything. I use Raspberry PI 2 B+ with RaspiComm. I connect with minicom and see only "R00000000" (I didn't connec...