Part No. 712318 -This number has to match your existing faulty PCB Unit, Located In The Corner. Vaillant ecoTEC VUW (condensing system) ecoTEC plus 824 (GC No. 47-044-31). Vaillant ecoTEC VUW (condensing system) ecoTEC plus 831 (GC No. 47-044-32).
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