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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
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Inherited a Vaillant ecotech plus 837 when we moved in... 100% won’t be getting a vaillant to replace it, put it that way...
terlg
Tacheovale
@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.