Great Barr: a Vaillant ecoTEC 937 that kept needing a reset, with F.62 and F.75 in its fault history, a new PCB and pressure sensor, and a full strip-down service on one visit
The last ten faults were all F.62 and F.75. A new PCB from the van, a blocked pressure sensor replaced, the expansion vessel recharged and a full strip-down with a new burner seal.
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