phase change and time outs
Actually, Miele washers of that vintage do have a built-in time out on the fill. Yes, if the water pressure sensor indicates that the proper level has been achieved the timer will advance. But these machines still only alloted a given span of time for filling. No feedback from the sensor within that time span and the machine went into it's famous click, clack, click program, bringing the timer back to stop. The schematic packed with these machines as well as the instruction manual has clear instructions on how to deal with very low water pressure.
At least in Germany, Miele's de-scaler is a mixture of citric and a second acid (Ameisensaeure, don't know the English name but think it is 'formic' as in Ant) together with some buffers, etc. Vinegar, at least on my most modern Miele is Verboten!
I don't recall whether it was me or someone else who made that statement about the '2-phase'. If it was me, sorry! I have tried to block that ridiculous bit of queenly bitchiness out. I teach technical terminology to, among others, electrical engineers in Munich, but try to speak like a normal person. What a horrid thought that I could be so catty. Again, dear lady, my apologies. Every normal person uses words which only the PC-Police object to. Two-phase instead of split-phase. Neutral instead of the 'Grounded (not Grounding)' wire, etc.
I strongly suspect those dear souls strike out the plus and minus signs on their batteries and paint them onto the 'correct' ends...