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We just had one of these installed - our "vaillant advanced" installer still hadn't seen one before either and it subsequently broke in the space of a few weeks. to be fair, getting vaillant round to check and repair it was easy
terlg-
Lemme guess. CO / all gas sensor - error code F55?
Apparently they’re much more complicated to commission and set up properly. FWIW an engineer eventually worked out that the flue fan power wasn’t high enough so the condensed water was running back into the boiler and tripping the sensor. TBF we do have a slightly convoluted flue run, but it took months for someone to work this out, all the other guys just changed various parts at random.
dbr
Don’t go too cutting edge. We got a Vaillant EcoTech Exclusive super green blah blah a few years ago when it first came out.
All the engineers that came round (three or four before someone worked out the problem) said they’d never seen one before. Ours was basically a test case to see what goes wrong and consequently what setting to use on future models. Luckily I wangled a seven year warranty so all this was free, if very frustrating.