Zanussi WJS1397 'clicking on' and not stopping at end of cycle?

I have a Zanussi WJS1397 Washer Dryer. What it will and wont do is very unpredictible. It mainly clicks on, at about 2 second intervals, through the program and only stops at Q (end of a woolens wash), no matter what program (whites/colours/woolens) it started at. Other times it will do part of the wash (either the main wash or the rinse but rarely both).
When it does the rinses, it normally only does one fill of water rinse, when it used to do two/three (depending on program).
When it actually does a spin, it doesn't stop when it reaches the tumble-dry stage. It doesn't even stop for the end of program, and continues through to the next program.
Tumble-drying lasts for about 10 seconds, with no rotation of the drum.
The machine had these probems about 2 months ago, which lasted for 2 weeks, then it seemed to fix itself, until a couple of weeks ago.
I have removed the two pressure switches, and they are changing contacts when pressure is blown into them. I also removed and tested the program dial unit, and checked that all the micro-switches activeted properly.
When water does enter, then it does go to the correct level.

Is there a unit that controls the timing for each stage?