Keston
C36
| 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 |
| E31 | 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. |