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They come in different sizes, so be sure they fit well.

Example:
https://www.reichelt.com/de/en/split-fe ... 25738.html

After moving the gateway further away from the boiler, I experienced far less problems, but it still froze once in week or so. Then I replaced the connection between the boiler and gateway by shielded cables and put some ferrite beads on it. And now its running stable for more than a month. Pretty s...

My cellphone is equiped with a magnetometer, so I held it right next to the boiler at the location of the otgw. After turning on the hot water tap it showed me a highly intense sine wave. So I probably found out what's frying my PICs. Next I'm going to mount the otgw at some other location; further ...

Bad News. The otgw was working well with the new PIC for about a month. Since last week I've got the same issues as before: no new messages in the logfile while the red led is turned on. And once again it overrode the room setpoint to 67 degrees and the room thermostate indicated an OT error. The la...

Nodo-shop sent it for free.

It looks like the new PIC solved my issues. The gateway is running for more than a week now, without any problems.

Thank you very much for all your time!

Actually, I didn't check that. Since I received it in a sealed package, I assumed it came without firmware.

But I've connected it and it seems to contain the firmware already.

Everything is running fine right now.

Lets see if it keeps running for more than a few hours or days...

I've got a new PIC from Nodo. So I replaced the old PIC and tried to upload the firmware. After hitting the "Program" button, the status bar says "Switching gateway to self-programming mode", and after a few seconds it says "Please manually reset the OpenTherm Gateway"....

None of the components are getting warmer than about 28°C at maximum.
Before and after failure is 5V DC actually 4.98V and AC < 0.01V. Sounds pretty much okay to me.
Sorry, no oscilloscope in my toolbox.

I did download the firmware from http://otgw.tclcode.com/download.html and the md5sum was correct. To measure temperature I used an IR themermometer. I did a background measurement when the otgw was turned off for a many hours: 21°C, which is pretty close to the temperature in the boiler room. Then ...

After I reinstalled the firmware the same issues occurred as before. Each time it fails after a few hours. Sometimes after less than 2 hours, sometimes it runs for about a day. Today I reinstalled the firmware again, but unchecked the "Transfer old EEPROM settings" option. Just a few hours...

First a question: In the logfile each "Data" line is followed by its "Ack" line immediately. Except for "Remote override room setpoint", where "Data" and "Ack" are always separated by "Burner starts" or "Burner operation hours". I...

The thermostat is just set to its maximum value of 35 degrees. Something (?) tried to set it even to 67.22 degrees (see logfile 13:17:08.869582). I attach quite a bit of lines from the log file for context, with some comments: 13:16:46.064621 T80000200 Read-Data Status: 00000010 00000000 13:16:46.17...

I disconnected the otgw for the weekend and reconnected it today around lunch time. 9 hours later I check the leds and this time the red led is on continuously. The last 4 lines in the logfile: 20:22:39.057988 T10010A00 Write-Data Control setpoint: 10.00 20:22:39.201722 BD0010A00 Write-Ack Control s...

I just checked my OTGW and the green led was continue on. Last message in log file was from 10:13:03 this morning. Display of room thermostat showed current room temperature and no errors. # export DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-MMeasgLFKD # dbus-send --dest=com.tclcode.otmonitor -...