NEST 3 compatability w/OpenTherm

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NEST 3 compatability w/OpenTherm

Postby wfh118 » Tue Dec 27, 2016 4:12 am

I am trying to install a NEST 3 UK version on a BAXI LUNA HT 330 Combi. The interface is Siemens OpenTherm motherboard 567715.2 using a QAA73.110 controller. Boiler installed in 2006. Installation of Nest and Heat Link unremarkable. Thermostat initiated properly, recognizes OT interface present (radiant floor heat), but in the test (and repeatedly), the set thermostat believes the boiler is running, predicting time to temperature attained. Nothing is happening at the boiler. Test times out. Run troubleshooter but no errors are posted. Am I experiencing an incompatibility issue? If so, are there any feasible solutions?
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Re: NEST 3 compatability w/OpenTherm

Postby wess51 » Sun Jan 15, 2017 8:33 am

I have same issue with Nest 3rd gen and BAXI 1400. My system also equipped with OpenTherm interface and QAA.73. After installing and trying to do some tests, there's no reaction from boiler. I can't imagine what we do wrong...
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