Problem Solution
Diverter valve problems in heating or hot water mode Before replacing the diverter valve/CVBC unit, try a harness resistor (400V/110mF) wired in series with the diverter valve. Resistor part number C10C420000
Fault code E05

As per fan problem E04


States flow sensor faulty, however there is a separate thermal fuse near the fan, wired in series with the flow sensor. Faulty seals will cause this fuse to fail.