Vaillant ecoFIT pure and ecoFIT sustain fault codes

Built 2017 onwards

VUW 256 to 356/6-3 combis, the system boilers and the open-vent models. Two-digit codes and a one-second press of the fault clearance key; the tables add F.86 underfloor contact, F.87 to F.89 connection faults and F.97 PCB self-test, and print F.75 simply as "pressure switch defective".

Codes on the ecoFIT pure and ecoFIT sustain follow the same Vaillant scheme as the rest of the range. Where a code behaves differently on this generation, the code page says so.