Siemens iQ500 Washer/Dryer – WD14U520GB Starts Program then Resets and Freezes

[Huw_F]

I have a Siemens iQ500 washer/dryer – WD14U520GB. If you try to start any program, the time comes up, it starts to fill, then just stops. After about 2 minutes, sits there the resets to the beginning of the program.
if you try to do anything, the start/pause button disappears and the door lock symbol shows. The only way to recover from this is to power the m/c off and power it back on, sometimes you have to wait a long period before it will power back on.
There is definitely nothing in the filter. I have checked the outlet is clear all the way to the outside drain. I can use just the drain function, but if I try to add spin, you get the same sort of scenario. I can empty the drum totally (open the filter) and remove all the contents using the manual release and remove the power to the m/c (unplug the mains) and try from scratch but still get the same problem.
I have also remade all the connections on the UI Panel and as many as I can get to on the 2 control boards and checked the pressure switch tube to the Drum is clear.
Any suggestions as to what may be wrong? are there any diagnostics I can run?

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