Intergas Kombi Kompakt HRE + Nest 3e Gen Learning Thermostat

Hello,

I live in the Netherlands but my Dutch is not so good. So I hope English is okay. I would appreciate any attempt to help because I am already hopeless.

I have an Intergas Kombi Kompakt HRE boiler.

Previously, the Honeywell Round On/Off thermostaat was connected to ports 6/7 of the boiler. Everything was working just fine.

I got the Nest 3rd Generation Learning Thermostat and saw I have two ways to connect it to the boiler - one with on/off and one with OpenTherm.

I am trying to connect it with OpenTherm (ports 11/12 of the boiler to OT1/OT2 on the Nest HeatLink, 6/7 disconnected) and no success - I get the H73 error on the Nest Thermostat).

I did a log of googling and people with the HRE boiler simply didn't get it to work using OpenTherm.

I am writing here to see if anyone managed to do that. If so, do you have any information/learning to share?

Bedankt!
 

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