Hi SebaV, I've got the same answer from Viessmann Romania for pairing a ViCare thermostat (ON-OFF) with an external sensor (7427232) on a Vitodens 111W. Allthow for 1 day one of Airmec engineer managed to do the pairing but unfortunately the battery of the vicare runoff and lost connection with the external sensor and never managed to get it back, you can see the picture attached. This means it can be done, but the engineer can't recall what he actually did to make it work.
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