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It seems that my measuring action has fixed the issue. Could be a loose soldering connection I guess, because after I tested with the multimeter, all of a sudden the diagnostics test (4) starts working. I guess tomorrow I will resolder R6 just to be sure and then reconnect the boiler and thermostat....

I just got around to testing your conclusion. Unfortunately, R6 seems to be doing just fine. Connected to GND on one end (testing no resistance between the same end of R4, also tested connection to D1 and D2 successfully. Also pin17 of the PIC connects to the other end of R6. Testing the resistance ...

By keeps reporting it, I mean that I can't get the OTGW to detect the thermostat. So power cycling, resetting, reflashing firmware, nothing works. The requested outputs from the diagnostics firmware: Opentherm gateway diagnostics - Version 1.3 1. LED test 2. Bit timing thermostat 3. Bit timing boile...

Recently the transformer of my OTGW gave up. I've replaced it and everything seems to be working (boiler side), but whatever I'm trying, otmonitor keeps reporting Thermostat not connected . Also the diagnostics firmware does not register anything from the thermostat. I'm sure that the thermostat its...

For now, "ignore multiple mid-bit transitions" seems to have solved the connection issues. I don't understand why connecting the OTGW USB connector causes error 01 in gateway mode? Apparently, when running in gateway mode while nothing is connected, everything works fine... I guess I just...

I have the OTGW between my Honeywell Wireless Modulation thermostat and Bosch HRC35 Top boiler. As long as I don't have the USB connection connected there are no issues (but what's the point of having an OTWG without being able to read any values, right? ;- ) ). Whenever I connect it to my RasPi run...