I have had the same sort of long running problems with the DHW side of a Potterton Statesman Flowsure (not the "plus") as many others and have decided to take the advice of Gasguru from some years back and take off the plate heat exchanger and re-configure the boiler as a conventional S Plan CH and DHW tank system. While Gasguru indicated that re-wiring was potentially easy, he gave no details. The Flowsure is effectively wired as W Plan with a 3-way diverter valve, so only potentially provides one live terminal for one of the 2 x S Plan two port valves to get power from.
Has anyone got experience of doing this and can even provide a re-wiring guide, as there are potentially four thermostats involved and a DHW flow switch within the Flowsure facia/PCB (I do have a wiring diagram).
As the revised system is also intended to give CH behind a Solar Thermal hot water system, I am also considering keeping a Plate Heat Exchanger on the Solar Thermal side, using the thermal store tank as pre-heat before or after the Plate Heat Exchanger.
Any/all advice welcomed.
Has anyone got experience of doing this and can even provide a re-wiring guide, as there are potentially four thermostats involved and a DHW flow switch within the Flowsure facia/PCB (I do have a wiring diagram).
As the revised system is also intended to give CH behind a Solar Thermal hot water system, I am also considering keeping a Plate Heat Exchanger on the Solar Thermal side, using the thermal store tank as pre-heat before or after the Plate Heat Exchanger.
Any/all advice welcomed.