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Unfortunately, I cannot show you any logs anymore because the problem is gone . If it happens again, I will try to capture the raw data to be able to do further analysis.
I can test the new version of otmonitor if necessary.

I can confirm the quick flashing leds are solved in the fw version 4.0b5. Furthermore, I noticed that the room setpoint was wrong (it was 15 degrees before, but it now shows 14.65). I vaguely remember that it was correct for 4.0b4. Therefore I tried to upload the old firmware (4.0b4) but I am not ab...

I tried to upload the new firmware, but I'm not able to do that anymore. I tried more than 20 times, but the firmware upload stops randomly between 10 en 80%. Tried both ways: (1) using the rs232 chip with usb-to-rs232 adapter and (2) using the USB-TTL level converter (which previously worked well)....

I received the rs232 chip and used a USB-to-rs232 converter as mentioned earlier. That solved my issue, and now the gateway works without issues. Of course, I'm willing to test you solution. I will get the soldering iron again :D and come back with the results. Sidenote: thanks to http://www.openthe...

Just a quick update. I tried placing a cap between the power pins, but no difference. I also connected the ground and power pins directly to the regulator to be sure the issue wasn't caused by an unstable ground due to possible high ground currents, but this seems to have no influence either. Unfort...

Thanks for the suggestion. I tried to get the gateway in an incorrect state without touching the USB cable plugged into the router. The fast blinking leds only happen when I remove the power from the router. Currently, I can't find another way. Nevertheless, I'm not happy with the situation. Not bec...

Indeed, touching the ground seems to have some effect. The reason I like to have this issue fixed is because I intend to connect this gateway to my router. If the router resets, I do not like my opentherm gateway to instruct the boiler to start heating :( Maybe the only option is to install the rs23...

I did more experiments while keeping an eye on the leds and notice a difference between the firmware versions. This is what I noticed. gateway.hex version 3.4: After powerup and USB connected: good situation, transmit led blinking twice every second. Disconnecting USB: bad situation, no leds active....

I just soldered the leds onto a breadboard. When the gateway is in normal operating mode, only the led "Transmit" is blinking twice every second. When I disconnect the USB plug, the led is not blinking anymore (e.g. all off). When the USB device was not plugged in, I disconnected the USB g...

Sorry, I tried gateway.hex version 3.4 and gateway-4.0b4.hex already. Same result. I also tried the delay symmetry test from diagnose.hex version 1.0 which gives: Enter test number: 4 OK1A high-to-low: 10us OK1A low-to-high: 25us OK1B high-to-low: 4us OK1B low-to-high: 5us This doesn't look right to...

I bought the USB version of the opentherm gateway: [1]. Soldered it, and it looked fine. The otmonitor works fine. I did a test by turning the thermostat and I could see the values and flame status change. I also did a hot water test, and that went fine to. Nice work! But when I unplug the USB cable...