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Of course I immediately did hook up the device to the boiler/thermostat. It works, I get readings of the roomtemperature and boiler water temperature. So both appliances give info. Great! The resistor (R2) I replaced had the resistance value as advertised, so I suspect it malfunctioned due to bad so...

Your help is highly appreciated! Ok, there we go: X1 and X2 still wired, OK1 removed, IC1 pin 18-5: 0V pin 3 and 4 of the OK1: 3,5-4V remove power, resistance between pin 3 and 4 of the OK1: 4kOhm OK1 back in, power back on: R1 (0.5V) 0,65V R2 (1.2V) 0,0V R3 (0.6V) 0,75V D9 (1.7V) 1,85V D10 (15V) 14...

When I troubleshoot my otgw I measure 2,5V on pin 18 IC1 when X1 and X2 are wired. First this first: I have assembled the otwg myself and I'm no experienced solder, so it is possible it could be prone to all sorts of errors. I have connected the owtg on the boiler and thermostat (Remeha Tzerra 28c a...

Hahaha, oh boy, your absolutely right. To my defense: it was late already?
But I can say that you can spend lots of time troubleshooting if you can't see the obvious.
Thanks for your help.

So I did solder my DIY gateway myself and granted it was the first time I did solder anything, now I have a wrong polarity on pin 5 and 14 on IC1. (the polarity on IC2 pin 15-16 is ok) I can't figure out what I have done wrong. I double checked that all is in the right spot, but there has to be some...