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I'm trying to understand the logic behind the UI, KI, AA and DA commands. My OTGW is operational for almost a year but keeps generating errors 03 and 04. I suspected the cabling and have played with resistor values and reference voltage settings (VR) but all to no avail. When I saw this post, which ...

You have to configure the iSense to accept this.
This is done via: Menu > Instellingen > Installateur > Externe Ingang > Toestaan.
(assuming Dutch language version)

hvxl wrote:Correct, with IT=1 Error 01 can not occur.

I can confirm that after setting IT back to 1, the OTGW has been running perfectly stable for the past week, and not shown Error01 anymore.
It must have been cause by me when exploring the effect of all settings.

I get the impression you are not running your gateway with the default setting for IT, i.e.: PR=T will return a 0 in the first position. The first thing to try is to set it back to default with the IT=1 command. The OTGW doc says about IT: Ignore Transitions - If the opentherm signal doesn't cleanl...