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I think I don't understand your question. Why would you connect the Calenta with 0-10V in stead of OpenTherm? Both the Calenta and the Elga Ace supports OpenTherm. Then the Elga Ace will send the required temperature for the heating system. If you want to monitor the setup you should put an OTGW bet...

Thanks for the analysis! Unfortunately with the new firmware (PRELOADT0=201) and the eTwist my OTGW broke again. I'm afraid the thermostat asks the boiler for a bigger current/voltage the OTGW can handle. This is the log with the (last) communication: 05:37:53.662526 Error 03 05:37:53.691515 T900200...

I changed line 190 in gateway.asm from constant PRELOADT0=100 to constant PRELOADT0=178 The output results in almost the same firmware as 4.2.5 gateway.hex. Only line 185 changes from :100B3000DD01640891020630031C91028C106430C0 to :100B3000DD01640891020630031C91028C10B23072 The resulting gateway.hex...

I reasoned that either Q1 or D9 should be the cause of the problems, since the problem was in the receiving part of the boiler interface. I replaced Q1 with a new one and the interface is working fine again. Then I flashed the customized firmware, connected X1 to the eTwist and did not connect the b...

I removed IC1 and connected X1 to X2. When I connect IC1 pin 2 to pin 14 (VCC), the voltage on X2 changes and IC1 pin 17 changes. When I connect IC1 pin 3 to pin 5 (GND), the current on X1 changes from 20,2 mA to 6,1 mA. IC1 pin 18 however stays all the time to 0,0V. The connection to the thermostat...

Unfortunately changing PRELOADT0 to 178 does not help for my setup. I'm getting the Error 03 about every second. In monitor mode (as well as in gateway mode) the display of the eTwist doesn't turn on. Is there a way to directly pass through the OT signal to see if without any software the setup is w...