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Hi Schelte, got a thermostat on loan now. Connecting the thermostat directly to the boiler works fine. I can see water temperatures, outdoor temperature, water pressure, all there. Connecting the thermostat via the gateway gives the following output in minicom: OpenTherm Gateway 4.0a10 T00030000 T00...

Hi Schelte,

thanks for the analysis! I have an offer to get a thermostat posted to me on loan, so I will try that next then.

All the best,
Marc

Hi Schelte, diagnostic test #4 yields: Opentherm gateway diagnostics - Version 1.1 Enter test number: 4 OK1A high-to-low: 8us OK1A low-to-high: 28us OK1B high-to-low: 9us OK1B low-to-high: 3us The voltages are: R2 + R3 against GND1(red line is 1.54 V) R2_R3_small.png OK pin 5 against GND (red line i...

Hi Schelte, thanks for testing this! Yes, one wire bridge has to be removed on the boiler to enable OpenTherm communication, but I have done that. I also measured the voltage coming from the boiler on the gateway contacts, so electrically that's all fine. I can hook an oscilloscope up on it. Is ther...

Hi Schelte, apologies, yes, that information was very unspecific. I have now tested the electrical connection and it is fine, but no change. This is what it looks like (in minicom): OpenTherm Gateway 4.0a10 Thermostat disconnected R00000000 R80190001 R10010A00 R00060000 R00110000 R001B0001 R801C0000...

Hi Schelte, haven't got around to test the cabling in the house yet, but have just been told that someone else has tested the beta firmware without a thermostat and got no communication from the boiler. It all worked fine for him with a thermostat connected. Thus, I'd like to ask you what the curren...

... aehm, sorry. It is actually connected to X2...

Hi Schelte, thanks for your reply! Going through the troubleshooting guide yields: -> IC1 voltage: 4.96 V -> X1 voltage: 22.2 V -> X1 current: 6.4 mA -> Connect IC1 pin 3 to 5 -> X1 current: 20.5 mA -> Connecting X1 and X2 -> Connect IC1 pin 2 to 5 -> X2 voltage: 16.8 V -> Connect IC1 pin 2 to 14 ->...

Hi, many thanks! The patched version of otmonitor works fine. I've ordered the USB version of the OpenTherm gateway, so am using the USB to serial that comes with it. I have now loaded firmware 4.0a10 onto the gateway and I can see the following output in the log window: 21:42:50.539988 R801C0000 Re...

Hi, finally got around to solder and connect my OpenTherm gateway to my boiler. Using minicom with 9600 baud on /dev/ttyUSB0 under linux shows that the gateway has the diagnostics firmware on it: Opentherm gateway diagnostics - Version 1.0 1. LED test 2. Bit timing thermostat 3. Bit timing boiler 4....