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That's been a terrible misread from my end, sorry about that. Measured pins 5 and 18 of IC1, no change, everything 0 Volts.
Resistance between IC1-5 and the "OK1 side" of R4 is about 1 Ohm. Same goes for the other side of R4 and IC1-18. If I measure the OK1 side of R4 to IC1-18 I get 330 Ohms. If I ...

My volt meter hooked up to pin 18 of IC1 and pin 5 of OK1:
Enter test number: 5
Thermostat: 3.21
Boiler: 0.00, 0.40, 4.54, 4.80
Reference: 1.21


Volt meter itself showed 0.00 with a setting of 200mV (so that's pretty close to 0 :-) ), before, during and after the tests.


When I disconnect my ...

This might be a bit odd, but it was something that I noticed when I started installing. I did not receive 558's but 557's, and a 548B instead of an A. Since there were 4 of them I decided to just install them on their designated positions, I just assumed there had been an update in the design/specs ...

Thanks for the quick reply. I have measured my resistors (just wanted to be sure and measured everything). All the resistors are as specified on the Gateway schematic at http://otgw.tclcode.com/otgw-wt.gif
Resistances between the R4 and GND and pin 18 of IC1 were either around 4 Ohms or around 334 ...

Well, after doing some measurements I am (even more) confused :-)
Power supply topic appears correct: 1.6kOhm on X3, ~5.03 Volts on both pins on IC1 and IC2
OT Interfaces is where I'm getting confused: 26 Volts on X1, but strange measurements in the Amps. Most of the time I'm measuring between 20 ...

Thought I'd post a little update here. I actually haven't been able to test anything just yet, but I went to the shop and bought myself a voltage meter (because my old one appeared to be broken). I'll do some measurements over the weekend and will try running the diagnostics after going through the ...

Many thanks for the quick response.

I did run diagnostics when it wasn't connected. Since I didn't get much of an output, I thought it'd be okay.
When I had it hooked up to both the boiler and the thermostat, I remember trying to run diagnostics again, getting output that looked sane on #2, a whole ...

Hi there,

Let me start by saying I have no experience whatsoever with OpenTherm or the OpenTherm gateway. I am however a well rounded IT professional and a software engineer by profession.
I have received my Opentherm Gateway DIY kit (+USB and LAN/WLAN) today, soldered it together following the ...